ISEE Middle Level Math : How to find median

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

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Example Question #1 : How To Find Median

On the last day of school, Adam asked each of his classmates how many days of school they missed for the entire school year.  He created a stem-and-leaf plot with the information.

0 | 0 0 2 4 5 6 8

1 | 0 0 1 2

2 | 3

4 | 7

What is the median number of school days missed by Adam's classmates?

Possible Answers:

\dpi{100} 4

\dpi{100} 8

\dpi{100} 5

\dpi{100} 10

Correct answer:

\dpi{100} 8

Explanation:

In a stem-and-leaf plot, each number on the right side of the vertical lines is a piece of data.  For instance, the "4 | 7" means one student missed 47 days(!) of school.  Each number on the left of the line represents the ten's digit, and each number on the right of the line represents the one's digit.

We can find the total number of classmates by counting the numbers on the right side of the vertical lines, which in this case is 13.

The median of a group of data represents the physical middle of the data. 

If there is an even number of pieces of data, you take the middle two pieces of data, add them up, and divide by two for the median.

If there is an odd number of pieces of data (such as here), one number represents the median.  Since we have 13 pieces of data, the 7th value is the median, because we would have 6 pieces smaller or equal to it, and 6 pieces greater than or equal to it.

The seventh piece of data here is the 8, which is "0 | 8".  Since the ten's digit is 0, that means that the median number of days missed is 8.

Example Question #2 : How To Find Median

Find the median of this set of numbers: 89, 75, 111, 94, 36, 89, 81.

Possible Answers:

Correct answer:

Explanation:

Place the numbers in order from least to greatest:

36, 75, 81, 89, 89, 94, 111

Identify the middle number in the set. The answer is

Example Question #3 : How To Find Median

Find the median in this set of numbers:

3021, 3211, 3120, 3102, 3012, 3201, 3210, 3112, 3011

 

 

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Then, identify the middle number:

Answer: The median is 3112.

Example Question #4 : How To Find Median

Subtract the median from the mode in this set of numbers:

241, 244, 422, 424, 422, 214, 412

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Identify the mode (most frequently appearing number): 

Identify the median (middle number):

Finally, subtract the median from the mode:

The answer is 10.

Example Question #5 : How To Find Median

Find the median in this set of numbers:

1144, 1187, 1198, 1034, 1073, 1187, 1081

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest.

Identify the middle number in the set.

Answer: The median is 1144.

Example Question #6 : How To Find Median

Find the median in this set of numbers:

2521, 2512, 2525, 2552, 2551, 2525, 2515

Possible Answers:

 

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Identify the middle number: 2525

Answer: The median is 2525.

Example Question #7 : How To Find Median

Find the median in this set of numbers:

9881, 9889, 9818, 9981, 9891, 9918, 9989, 9889, 9198

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Identify the middle number:

Answer: The median is 9889.

Example Question #8 : How To Find Median

Find the median in this set of numbers:

3343, 4434, 4334, 3343, 4343, 3434, 3334

Possible Answers:

Correct answer:

Explanation:

First order the numbers from least to greatest:

Then, identify the middle number: 3434.

Answer: The median is 3434.

Example Question #9 : How To Find Median

Find the median in this set of numbers:

6363, 6336, 6366, 6633, 6333, 6363, 6663

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Then, identify the middle number:

Answer: the median is

Example Question #10 : How To Find Median

Find the median in this set of numbers:

9080, 9008, 9800, 9099, 9009, 9090, 9008

Possible Answers:

Correct answer:

Explanation:

First, order the numbers from least to greatest:

Then, identify the middle number: .

Answer: The median in 9080.

 

 

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