Question

Erin's math test scores are 93, 78, 89, 83, and 83. She has one more math test this semester. What score must she get on the test to have a mean score of 85?

Answer 1

84

Explanation:

`\displaystyle (93+78+89+83+83+x)/(6)=85\\\\\displaystyle 426+x=510\\\\x=84`

Therefore, Erin would need to score an 84 on her last test to get a mean score of 85.