Question

Connie’s first three test scores are 79%, 87%, and 98%. What must she score on her fourth test to have an overall mean of exactly 90%?

Answer 1

Explanation:

You want the average of FOUR test scores to equal 90 :

( 79 + 87 + 98 + x ) / 4 = 90 ( assuming they are all weighted equally)

x = 90*4 - 79 - 87 - 98 = 96 % needed