Question

Abby scored 87, 93, 96, and 89 on her first four history quizzes. What score does

Abby need to get on her fifth quiz to have an average of exactly 91 on her history
quizzes?

Answer 1

73

Explanation

To find the average we need to find the mean. So you have

87,93,96, and 89. Add it up and you get 365. Next you have to divide it by how many numbers there are, so 365 divided by 5 and you get 73.

(I divided 365 by 5 because we are looking for the score she needs on the 5th quiz too.)