Question

Rachel has taken 6 tests so far and has received scores of 83%, 92%, 79%, 88%, 89%, and 95%. What must Rachel receive on her seven test to have an average score of 90%?

Answer 1

104% in his next test

Answer 2

let the score on her seventh test be "x".

SO,


`(83+92+79+88+89+95+x)/(7) =90\\\\ (526+x)/(7)=90\\\\ 526+x=630\\\\x=630-526\\\\ \boxed{x=104}`

∴ He must get 104% on his seventh test to get an average score of 90%