PSAT Math Multiple-Choice Question 279: Answer and Explanation

Question: 279

The table shows the weight of 100 laptops. Find the mean weight to the nearest hundredth of a pound.

Weight	Quantity
3 pounds	35
4 pounds	24
5 pounds	19
6 pounds	11
7 pounds	11

• A. 3.79
• B. 4.09
• C. 4.39
• D. 4.69

Correct Answer: C

Explanation:

The correct solution is 4.39 pounds. The sum of the weights is 3 × 35 + 4 × 24 + 5 × 19 + 6 × 11 + 7 × 11 = 105 + 96 + 95 + 66 + 77 = 439. The average weight is 439 divided by 100, or 4.39 pounds. See Lesson: Interpreting Graphics.