Middle School Math Quiz: Display Data In Statistical Plots

20 questions · exam conditions

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Display Data In Statistical PlotsQuestion 1 of 20

A teacher summarizes the number of minutes students spent reading last night using these bins:

0–9: 1 student
10–19: 4 students
20–29: 6 students
30–39: 3 students

Which histogram is correct?

Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 6, 4, 3, and the bars touch.

Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 4, 6, 3, and the bars touch.

Bars for 0–9, 10–19, 20–29, 30–39 with heights 2, 4, 6, 3, and the bars touch.

Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 4, 6, 3, but the bars are separated by gaps.

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Middle School Math Quiz

Middle School Math Quiz: Display Data In Statistical Plots

Practice Display Data In Statistical Plots in Middle School Math with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Display Data In Statistical Plots, giving you a quick way to practice the rules, question types, and explanations that matter most for Middle School Math.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A teacher summarizes the number of minutes students spent reading last night using these bins:

0–9: 1 student
10–19: 4 students
20–29: 6 students
30–39: 3 students

Which histogram is correct?

Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 6, 4, 3, and the bars touch.
Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 4, 6, 3, and the bars touch. (correct answer)
Bars for 0–9, 10–19, 20–29, 30–39 with heights 2, 4, 6, 3, and the bars touch.
Bars for 0–9, 10–19, 20–29, 30–39 with heights 1, 4, 6, 3, but the bars are separated by gaps.

Explanation: Tests displaying numerical data in statistical plots on number line: dot plots (dots stacked at values), histograms (bars for binned intervals), box plots (five-number summary with box and whiskers). Dot plot: number line with values, stack dots vertically above each value (if data has three 7's, three dots stacked at 7 on number line, shows frequency by stack height and distribution by position); Histogram: bin data into intervals (60-69, 70-79, etc.), draw bars with heights=frequencies (7 students scored 70-79: bar height 7), bars touch (continuous data), shows shape (symmetric, skewed) and frequency distribution; Box plot: five-number summary (min, Q1, median, Q3, max), draw box from Q1 to Q3 (IQR=middle 50%), line at median inside box, whiskers extend to min and max (shows spread and center, identifies outliers if beyond whiskers). For example, data 5,6,6,7,7,7,8,8,10 displayed as dot plot: number line 5-10, stack dots (one at 5, two at 6, three at 7, two at 8, one at 10, shows mode at 7 with most dots); or histogram: scores binned 60-69(3), 70-79(7), 80-89(5), 90-100(2), bars touching at heights 3,7,5,2; or box plot: data 20,25,30,35,40,50,60 gives min=20, Q1=27.5, median=35, Q3=45, max=60, plot shows box from 27.5 to 45, line at 35, whiskers to 20 and 60. The correct histogram for reading minutes is choice A, with bars touching and heights 1, 4, 6, 3 for bins 0–9, 10–19, 20–29, 30–39. Common errors include separating bars with gaps (choice B), swapping heights like 4 and 6 (choice C), or incorrect frequencies such as starting with 2 (choice D). Creating dot plot: (1) draw number line with appropriate scale (min to max of data), (2) mark each data value with dot above number line, (3) stack dots if repeated values (three 7's→three dots stacked at 7); Histogram: (1) bin data (group into intervals: 0-9, 10-19, etc.), (2) count frequency per bin, (3) draw bars touching with heights=frequencies. Box plot: (1) find five-number summary (min, Q1, median, Q3, max from ordered data), (2) draw box from Q1 to Q3, (3) line at median, (4) whiskers to min/max; Interpreting: dot plot shows exact values and mode (most dots), histogram shows shape and frequency distribution, box plot shows spread (IQR, range) and center (median); Mistakes: dot plot stacking horizontal, histogram gaps, box plot box wrong extent, scale issues, frequency errors.

Question 2

A researcher has collected data and wants to choose between displaying it as a histogram or a dot plot. Her data set contains the values: 12, 12, 12, 12, 14, 14, 16, 18, 18, 20. Which statement best describes how the choice of display method would affect the interpretation of this data?

A histogram would better show the exact frequency of repeated values like 12
A dot plot would better show the exact frequency of repeated values like 12 (correct answer)
Both displays would show identical information since the data is already grouped
A histogram would better show outliers while a dot plot would hide them

Explanation: A dot plot would stack 4 dots above the value 12, clearly showing that 12 appears exactly 4 times in the dataset. It would also stack 2 dots above 14 and 2 above 18, making the frequencies of repeated values immediately visible. A histogram with intervals would group values together (like 12-15 containing both 12s and 14s), making it harder to see the exact frequency of individual values. Choice A reverses this relationship. Choice C is incorrect because the displays show information differently. Choice D is wrong because dot plots actually show individual values clearly, including potential outliers.

Question 3

Marcus recorded the number of books read by students in his class over summer vacation: 3, 5, 2, 7, 3, 8, 4, 3, 6, 5, 2, 4, 3, 7, 5. He wants to create a dot plot to display this data. If he sets up his number line from 0 to 10, how many dots will be stacked above the value 3?

3 dots because 3 appears 3 times in the data set
4 dots because 3 appears 4 times in the data set (correct answer)
5 dots because there are 5 different values near 3
6 dots because 3 is the 6th number in the list

Explanation: In a dot plot, each occurrence of a value gets represented by one dot stacked above that value on the number line. Counting the occurrences of 3 in the data: 3, 5, 2, 7, 3, 8, 4, 3, 6, 5, 2, 4, 3, 7, 5. The value 3 appears exactly 4 times, so 4 dots will be stacked above 3. Choice A miscounts by one. Choice C confuses the concept by counting nearby values. Choice D incorrectly uses the position of the first 3 in the list.

Question 4

A science class measured plant heights (in cm): 12, 14, 15, 15, 16, 18, 20, 21. A student wants to show the five-number summary on a number line using a box plot. Which option describes the correct box plot?

Min 12, $Q_1=14.5$ , median 15.5, $Q_3=19$ , max 21; box from 14.5 to 19 with a median line at 15.5; whiskers to 12 and 21. (correct answer)
Min 12, $Q_1=14$ , median 15.5, $Q_3=20$ , max 21; box from 12 to 21 with a median line at 15.5.
Min 12, $Q_1=14.5$ , median 15.5, $Q_3=19$ , max 21; box from 14.5 to 19 but no median line is shown.
Min 12, $Q_1=15$ , median 16, $Q_3=20$ , max 21; box from 15 to 20 with whiskers to 12 and 21.

Explanation: Tests displaying numerical data in statistical plots on number line: dot plots (dots stacked at values), histograms (bars for binned intervals), box plots (five-number summary with box and whiskers). Dot plot: number line with values, stack dots vertically above each value (if data has three 7's, three dots stacked at 7 on number line, shows frequency by stack height and distribution by position); Histogram: bin data into intervals (60-69, 70-79, etc.), draw bars with heights=frequencies (7 students scored 70-79: bar height 7), bars touch (continuous data), shows shape (symmetric, skewed) and frequency distribution; Box plot: five-number summary (min, Q1, median, Q3, max), draw box from Q1 to Q3 (IQR=middle 50%), line at median inside box, whiskers extend to min and max (shows spread and center, identifies outliers if beyond whiskers). For example, data 5,6,6,7,7,7,8,8,10 displayed as dot plot: number line 5-10, stack dots (one at 5, two at 6, three at 7, two at 8, one at 10, shows mode at 7 with most dots); or histogram: scores binned 60-69(3), 70-79(7), 80-89(5), 90-100(2), bars touching at heights 3,7,5,2; or box plot: data 20,25,30,35,40,50,60 gives min=20, Q1=27.5, median=35, Q3=45, max=60, plot shows box from 27.5 to 45, line at 35, whiskers to 20 and 60. The correct box plot for the plant heights is choice A, with min 12, Q1=14.5, median 15.5, Q3=19, max 21, box from 14.5 to 19, median line at 15.5, and whiskers to 12 and 21. Common errors include incorrect quartiles and boxing from min to max (choice B), missing the median line (choice C), or wrong five-number summary values (choice D). Creating dot plot: (1) draw number line with appropriate scale (min to max of data), (2) mark each data value with dot above number line, (3) stack dots if repeated values (three 7's→three dots stacked at 7); Box plot: (1) find five-number summary (min, Q1, median, Q3, max from ordered data), (2) draw box from Q1 to Q3, (3) line at median, (4) whiskers to min/max. Interpreting: dot plot shows exact values and mode (most dots), histogram shows shape and frequency distribution, box plot shows spread (IQR, range) and center (median); Mistakes: dot plot stacking horizontal, histogram gaps, box plot box wrong extent, scale issues, frequency errors.

Question 5

A class collected 14 temperatures (in °F) from a week of mornings and afternoons: 61, 62, 62, 63, 64, 64, 65, 65, 66, 66, 67, 68, 68, 70. Which plot type is best for showing the overall shape of the distribution without needing to see every exact value?

Histogram (groups data into intervals to show the shape clearly). (correct answer)
Dot plot (best when you want to see every exact value clearly).
Picture graph (not a standard statistical plot for distributions on a number line).
Stem-and-leaf plot (not one of the choices: dot plot, histogram, or box plot).

Explanation: Tests displaying numerical data in statistical plots on number line: dot plots (dots stacked at values), histograms (bars for binned intervals), box plots (five-number summary with box and whiskers). Dot plot: number line with values, stack dots vertically above each value (if data has three 7's, three dots stacked at 7 on number line, shows frequency by stack height and distribution by position); Histogram: bin data into intervals (60-69, 70-79, etc.), draw bars with heights=frequencies (7 students scored 70-79: bar height 7), bars touch (continuous data), shows shape (symmetric, skewed) and frequency distribution; Box plot: five-number summary (min, Q1, median, Q3, max), draw box from Q1 to Q3 (IQR=middle 50%), line at median inside box, whiskers extend to min and max (shows spread and center, identifies outliers if beyond whiskers). For example, data 5,6,6,7,7,7,8,8,10 displayed as dot plot: number line 5-10, stack dots (one at 5, two at 6, three at 7, two at 8, one at 10, shows mode at 7 with most dots); or histogram: scores binned 60-69(3), 70-79(7), 80-89(5), 90-100(2), bars touching at heights 3,7,5,2; or box plot: data 20,25,30,35,40,50,60 gives min=20, Q1=27.5, median=35, Q3=45, max=60, plot shows box from 27.5 to 45, line at 35, whiskers to 20 and 60. The best plot for showing the overall shape of temperatures without exact values is choice A, a histogram that groups data into intervals. Common errors include selecting a dot plot that emphasizes exact values (choice B), a non-standard picture graph (choice C), or a stem-and-leaf plot not among the typical choices (choice D). Creating dot plot: (1) draw number line with appropriate scale (min to max of data), (2) mark each data value with dot above number line, (3) stack dots if repeated values (three 7's→three dots stacked at 7); Histogram: (1) bin data (group into intervals: 0-9, 10-19, etc.), (2) count frequency per bin, (3) draw bars touching with heights=frequencies. Box plot: (1) find five-number summary (min, Q1, median, Q3, max from ordered data), (2) draw box from Q1 to Q3, (3) line at median, (4) whiskers to min/max; Interpreting: dot plot shows exact values and mode (most dots), histogram shows shape and frequency distribution, box plot shows spread (IQR, range) and center (median); Mistakes: dot plot stacking horizontal, histogram gaps, box plot box wrong extent, scale issues, frequency errors.

Question 6

A teacher grouped 17 quiz scores into intervals. The frequencies are:

60–69: 2 students
70–79: 6 students
80–89: 5 students
90–100: 4 students Which option describes the correct histogram (bars touch, x-axis shows score intervals, y-axis shows frequency)?

A bar chart with separate categories labeled 60–69, 70–79, 80–89, 90–100 where bar widths are different for each category.
Bars for 60–69, 70–79, 80–89, 90–100 have heights 2, 6, 5, 4, but there are gaps between the bars.
Bars for 60–69, 70–79, 80–89, 90–100 have heights 2, 5, 6, 4, and the bars touch.
Bars for 60–69, 70–79, 80–89, 90–100 have heights 2, 6, 5, 4, and the bars touch. (correct answer)

Question 7

A science class measured plant heights (in cm) for 9 plants: 8, 9, 9, 10, 10, 10, 11, 12, 12. Which option correctly describes the dot plot on a number line from 8 to 12?

Counts: 8→1, 9→1, 10→3, 11→2, 12→2 (stacked vertically above 8–12).
Uses an uneven scale on the number line labeled 8, 9, 10, 12 (skips 11), with dots placed above those labels.
Counts: 8→1, 9→2, 10→2, 11→1, 12→3 (stacked vertically above 8–12).
Counts: 8→1, 9→2, 10→3, 11→1, 12→2 (stacked vertically above 8–12). (correct answer)

Question 8

Based on the histogram shown, if this same data were displayed as a dot plot instead, how many total dots would appear above the number line?

12 dots total, representing the sum of all frequency values (correct answer)
4 dots total, representing the number of different intervals shown
8 dots total, representing the highest frequency bar shown
16 dots total, representing twice the number of intervals times frequency

Explanation: In a dot plot, each individual data point gets one dot, so the total number of dots equals the total number of data points collected. From the histogram, we add up all the frequencies: 3 + 5 + 2 + 2 = 12 total data points. Therefore, a dot plot of this same data would show 12 dots total distributed across the number line. Choice B confuses the number of intervals with data points. Choice C uses only the highest frequency. Choice D incorrectly doubles the calculation.

Question 9

A gym tracked how many minutes 14 students exercised in one day and grouped the data:

0–9 minutes: 1 student
10–19 minutes: 4 students
20–29 minutes: 6 students
30–39 minutes: 3 students Which histogram description is correct?

Bars for 0–9, 10–19, 20–29, 30–39 have heights 2, 4, 6, 2, and the bars touch.
Bars for 0–9, 10–19, 20–29, 30–39 have heights 1, 6, 4, 3, and the bars touch.
Bars for 0–9, 10–19, 20–29, 30–39 have heights 1, 4, 6, 3, and the bars touch. (correct answer)
Bars for 0–9, 10–19, 20–29, 30–39 have heights 1, 4, 6, 3, but the bars are separated by gaps.

Question 10

Based on the histogram shown, which statement about the data distribution is most accurate?

The data shows that most values fall between 15-25 with very few outliers
The data shows that most values fall between 10-20 with some higher values (correct answer)
The data shows that most values fall between 20-30 with a gradual decline
The data shows that values are equally distributed across all intervals shown

Explanation: Looking at the histogram, the bars for intervals 10-15 and 15-20 are the tallest (heights of 8 and 6 respectively), indicating most data falls in the 10-20 range. The bars for 20-25 and 25-30 show some data at higher values but much less frequency. Choice A incorrectly identifies the peak range. Choice C misidentifies where most data occurs. Choice D is wrong since the bars have clearly different heights showing unequal distribution.

Question 11

Looking at the dot plot, if you were to convert this data into a histogram with intervals 0-2, 3-5, 6-8, and 9-11, which interval would have the highest frequency bar?

The 0-2 interval would be highest with 4 data points total
The 3-5 interval would be highest with 6 data points total (correct answer)
The 6-8 interval would be highest with 5 data points total
The 9-11 interval would be highest with 3 data points total

Explanation: From the dot plot, counting dots in each interval: 0-2 interval (values 0,1,2) has 2+1+1=4 dots total. 3-5 interval (values 3,4,5) has 2+3+1=6 dots total. 6-8 interval (values 6,7,8) has 1+2+0=3 dots total. 9-11 interval (values 9,10) has 1+1=2 dots total. The 3-5 interval has the most data points (6), so it would have the highest bar in a histogram. Choices A, C, and D either miscount the dots or incorrectly identify which interval has the most data.

Question 12

Sarah collected data on the heights (in inches) of players on her basketball team: 58, 60, 62, 64, 66, 68, 70. She wants to create a box plot for this data. What will be the position of the median line in her box plot?

At 64 inches, which is the middle value of the seven data points (correct answer)
At 62 inches, which is the third value when counting from the left
At 63 inches, which is the average of the third and fourth values
At 66 inches, which is the average of all seven data values

Explanation: For an odd number of data points (7 in this case), the median is the middle value when the data is arranged in order. Since there are 7 values, the median is the 4th value: 58, 60, 62, 64, 66, 68, 70. So the median line in the box plot will be at 64 inches. Choice B confuses position with value. Choice C incorrectly applies the even-number median rule. Choice D confuses median with mean.

Question 13

A student recorded 12 daily temperatures (in $^\circ$ F): 62, 62, 63, 64, 64, 64, 65, 66, 66, 67, 68, 68. Which type of plot would be the best choice to show the exact values and how often each temperature occurred?

Dot plot (correct answer)
Circle (pie) chart
Box plot
Histogram

Question 14

A teacher grouped quiz scores into intervals. The counts are: 60–69: 2 students, 70–79: 5 students, 80–89: 4 students, 90–99: 1 student. Which option describes the correct histogram (bars touch, x-axis shows the score intervals, y-axis shows frequency)?

A bar chart with four separate categories labeled 60, 70, 80, 90 (not intervals), with heights 2, 5, 4, 1.
Bars over 60–69, 70–79, 80–89, 90–99 with heights 2, 5, 4, 1, but there are gaps between the bars.
Bars (touching) over 60–69, 70–79, 80–89, 90–99 with heights 2, 4, 5, 1.
Bars (touching) over 60–69, 70–79, 80–89, 90–99 with heights 2, 5, 4, 1. (correct answer)

Question 15

A teacher recorded how many books 10 students read over the summer: 1, 2, 2, 3, 3, 3, 4, 4, 5, 5. Which dot plot correctly displays the data on a number line from 1 to 5 (stack dots vertically above each value)?

Dots at 1(1), 2(2), 3(3), 4(2), 5(2), stacked vertically above 1–5 on an even scale. (correct answer)
Dots spread horizontally (not stacked): one dot at each of 1,2,3,4,5 and the extra dots placed between numbers.
Dots at 1(1), 2(3), 3(2), 4(2), 5(2) on a number line from 1 to 5.
Dots at 1(1), 2(2), 3(3), 4(2), 5(2) but the number line labels are unevenly spaced (for example 1,2,4,5).

Explanation: Tests displaying numerical data in statistical plots on number line: dot plots (dots stacked at values), histograms (bars for binned intervals), box plots (five-number summary with box and whiskers). Dot plot: number line with values, stack dots vertically above each value (if data has three 7's, three dots stacked at 7 on number line, shows frequency by stack height and distribution by position); Histogram: bin data into intervals (60-69, 70-79, etc.), draw bars with heights=frequencies (7 students scored 70-79: bar height 7), bars touch (continuous data), shows shape (symmetric, skewed) and frequency distribution; Box plot: five-number summary (min, Q1, median, Q3, max), draw box from Q1 to Q3 (IQR=middle 50%), line at median inside box, whiskers extend to min and max (shows spread and center, identifies outliers if beyond whiskers). For example, data 5,6,6,7,7,7,8,8,10 displayed as dot plot: number line 5-10, stack dots (one at 5, two at 6, three at 7, two at 8, one at 10, shows mode at 7 with most dots); or histogram: scores binned 60-69(3), 70-79(7), 80-89(5), 90-100(2), bars touching at heights 3,7,5,2; or box plot: data 20,25,30,35,40,50,60 gives min=20, Q1=27.5, median=35, Q3=45, max=60, plot shows box from 27.5 to 45, line at 35, whiskers to 20 and 60. The correct dot plot for the books read data is choice A, with dots stacked vertically at 1(1), 2(2), 3(3), 4(2), 5(2) on an even scale from 1 to 5, accurately showing the frequencies. Common errors include spreading dots horizontally instead of stacking (choice B), incorrect frequency counts like swapping 2 and 3 (choice C), or using an uneven scale that distorts the data (choice D). Creating dot plot: (1) draw number line with appropriate scale (min to max of data), (2) mark each data value with dot above number line, (3) stack dots if repeated values (three 7's→three dots stacked at 7). Interpreting: dot plot shows exact values and mode (most dots), histogram shows shape and frequency distribution, box plot shows spread (IQR, range) and center (median); Mistakes: dot plot stacking horizontal, histogram gaps, box plot box wrong extent, scale issues, frequency errors.

Question 16

A teacher recorded the number of books 10 students read over the summer: 1, 2, 2, 3, 3, 3, 4, 5, 5, 6. Which option shows the correct dot plot on a number line from 1 to 6 (one dot per student, stacked above each value)?

Dot plot counts: 1→1 dot, 2→2 dots, 3→3 dots, 4→1 dot, 5→1 dot, 6→1 dot (stacked vertically above each number 1–6).
Dot plot counts: 1→1 dot, 2→3 dots, 3→2 dots, 4→1 dot, 5→2 dots, 6→1 dot (stacked vertically above each number 1–6).
Dots are placed in a row (not stacked): one dot above 1, two dots spread horizontally above 2, three dots spread horizontally above 3, one above 4, two above 5, one above 6.
Dot plot counts: 1→1 dot, 2→2 dots, 3→3 dots, 4→1 dot, 5→2 dots, 6→1 dot (stacked vertically above each number 1–6). (correct answer)

Question 17

A student recorded the number of pages read each day for 10 days: 8, 10, 10, 12, 12, 12, 13, 15, 15, 18. The student wants a plot that shows each exact value and how often it occurs. Which plot type is the best choice?

Box plot
Line graph
Dot plot (correct answer)
Histogram

Question 18

A student created a dot plot for the data set: 2, 4, 4, 6, 6, 6, 8, 8. If she wants to convert this into a histogram with bin width of 2 (intervals: 1-2, 3-4, 5-6, 7-8), which interval will have a frequency that differs most from what the dot plot shows for individual values?

Interval 1-2 will differ most because it groups unlike values together
Interval 3-4 will differ most because it combines two different frequencies
Interval 5-6 will differ most because it has the highest individual frequencies (correct answer)
Interval 7-8 will differ most because it spans the widest numerical range

Explanation: In the dot plot, individual values show: 2(1 dot), 4(2 dots), 6(3 dots), 8(2 dots). In the histogram: interval 1-2 has frequency 1, interval 3-4 has frequency 2, interval 5-6 has frequency 3, interval 7-8 has frequency 2. The 5-6 interval combines the most individual data points (3) and shows the biggest change from individual value representation to grouped representation. Choice A is wrong because 1-2 only has one value. Choice B has a moderate change. Choice D incorrectly focuses on numerical range rather than frequency differences.

Question 19

Looking at the box plot, what can you conclude about the distribution of the data compared to what a dot plot of the same data would reveal?

The box plot shows exact frequencies, while a dot plot would show only ranges
The box plot shows quartile positions, while a dot plot would show individual data points (correct answer)
The box plot shows the mean value, while a dot plot would show the median
The box plot shows outlier data, while a dot plot would hide extreme values

Explanation: Box plots display the five-number summary (minimum, Q1, median, Q3, maximum) and show the quartile positions and spread, but they don't show individual data points or their frequencies. Dot plots show every individual data point as a dot, revealing the exact frequency of each value and the shape of the distribution. Choice A reverses the characteristics. Choice C is incorrect because box plots show medians, not means. Choice D is wrong because both plots can show extreme values, though differently.

Question 20

A cafeteria tracked the number of apples sold each day for 10 days: 18, 18, 19, 20, 20, 20, 21, 22, 22, 24. Which dot plot is correct on a number line from 18 to 24?

Dots at 18(2), 19(1), 20(3), 21(1), 22(2), 23(0), 24(1), stacked vertically above 18–24. (correct answer)
Dots at 18(2), 19(1), 20(3), 21(1), 22(2), 24(1) but the scale skips 23 and jumps from 22 to 24.
Dots at 18(2), 19(1), 20(3), 21(1), 22(2), 23(1), 24(0), stacked vertically above 18–24.
Dots at 18(1), 19(1), 20(3), 21(1), 22(2), 23(0), 24(2), stacked vertically above 18–24.

Explanation: A dot plot shows how often each number appears by stacking one dot for each time it shows up. Your job is to count and stack! Start by tallying each value in the list:

18, 18, 19, 20, 20, 20, 21, 22, 22, 24

$18$ appears $2$ times → $2$ dots
$19$ appears $1$ time → $1$ dot
$20$ appears $3$ times → $3$ dots
$21$ appears $1$ time → $1$ dot
$22$ appears $2$ times → $2$ dots
$23$ appears $0$ times → no dots
$24$ appears $1$ time → $1$ dot

Notice

23

still gets its own spot on the number line, even with zero dots, so the spacing stays even. Think of it like stacking blocks above each number's house. No visitors? The house is still there, just empty! Try this at home: tally how many socks you own of each color and build your own dot plot!