Mr. Williams trains a group of student athletes. He wants to know how they are improving in the number of push-ups they can do. These dot plots show the number of push-ups each student was able to do last month and this month.

How much did the mean number of push-ups increase from last month to this month?

Question 1 options:

2.75 more push-ups

4.375 more push-ups

7.5 more push-ups

There is not enough information given to answer the question.