The question asks for the difference in new members between Robotics and Debate clubs. Looking at the bar graph, I need to find the exact heights for Robotics and Debate bars using the y-axis scale. Robotics shows 45 students and Debate shows 35 students. The difference is 45 - 35 = 10 students. A common error is misreading bar heights when they're close together or estimating instead of using the scale precisely.

The question asks which flavor produced the greatest total profit using both the bar graph (boxes sold) and table (profit per box). I need to calculate: BBQ (20 boxes × $2 = $40), Sour Cream (25 boxes × $3 = $75), Salted (15 boxes × $2.50 = $37.50), Spicy (30 boxes × $1.50 = $45). Sour Cream has the highest total profit at $75. Students often confuse highest sales with highest profit or make calculation errors.

The question asks for a Week 5 prediction based on the Week 3 to Week 4 trend. From the graph, Week 3 shows 16 cm and Week 4 shows 18 cm, an increase of 2 cm. If this continues, Week 5 would be 18 + 2 = 20 cm. Students often use the wrong weeks to establish the trend or forget to add the increase to the Week 4 value.

The question asks for the modal bin (most common interval) in the histogram. Examining the bar heights for each 10-minute interval, the 20-29 customers bin has the highest frequency. This is the mode because it represents the interval with the most occurrences. Students sometimes confuse mode with mean or median, or misread which bar is tallest.

The question asks about the price change from Week 2 to Week 4. From the line graph, Week 2 shows $2.40 per pound and Week 4 shows $2.50 per pound. The change is $2.50 - $2.40 = $0.10 increase per pound. Students must be careful to subtract in the correct order and identify whether it's an increase or decrease.

The question asks which student fell short of the 60-page goal by the most. From the bar graph, I calculate shortfalls: Alex read 50 (short by 10), Bri read 55 (short by 5), Chen read 65 (exceeded by 5), Dev read 40 (short by 20). Dev fell short by the greatest amount at 20 pages. Students often miscalculate by subtracting in the wrong order or missing that Chen exceeded the goal.

The question asks how much money went to Savings if the student spent $1,500 total and Savings is 20%. The calculation is $1,500 × 0.20 = $300. Students often forget to convert the percentage to a decimal or might use the wrong total amount as the base for their calculation.

The question asks for the new total defects after removing 2 false alarms from Machine C. First, I sum all defects from the bar graph: A(4) + B(5) + C(6) + D(3) + E(7) = 25 total defects. After removing 2 from Machine C: 25 - 2 = 23 defects. A common error is only recalculating Machine C's count without updating the total.

The question asks on which day milk sales first reached at least 90 cartons. Examining the line graph from Day 1 to Day 7, I need to find the first day where the value is ≥ 90. Day 5 is the first day showing a value at or above 90 cartons on the y-axis. Students often confuse "first reached" with "highest value" or misread the scale.

The question asks how many students scored at least 80 on the test. From the histogram, the 80-89 bin shows 12 students and the 90-99 bin shows 8 students. The total scoring at least 80 is 12 + 8 = 20 students. Students often forget to include both bins when finding "at least 80" or misread the frequency values on the y-axis.