2011 AMC 8 Problem 11

Below is the professionally curated solution for Problem 11 of the 2011 AMC 8, from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2011 AMC 8 solutions, or check the answer key.

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Concepts:data and graph interpretation mean

Difficulty rating: 1020

11.

The graph shows the number of minutes studied by both Asha (left bar) and Sasha (right bar) in one week. On the average, how many more minutes per day did Sasha study than Asha?

$6$

$8$

$9$

$10$

$12$

Solution:

We can calculate the difference in average minutes by looking at the differences per day.

Starting with Monday, the differences between Sasha and Asha are $10,$ $-10,$ $20,$ $30,$ and $-20.$ This is a total of $30$ minutes. Therefore, the average difference is $30 \div 5 = 6.$

Thus, A is the correct answer.

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