Question

Molly scored 86, 87, 93, and x

on her four history tests. If her
average for the four tests was 91,
what is the value of x?

Answer 1

98

Explanation:

Average is the sum of all data points divided the number of data points.

In this specific situation, the average test score, 91, is equal to the sum of Molly's four individual test scores divided by the number of test Molly had, 4.

(( 86 + 87 + 93 + x) / 4) = 91

86 + 87 + 93 + x = 91/4

86 + 87 + 93 + x = 364

x = 364 - 93 - 87 - 86 = 98