Question

bill has the following test scores in science: 82% 88% and 96%. he hasn’t one more test to take this quarter. if bill wants husband test average to be 90% what score does he need to earn on his last test?

Answer 1

He needs to earn a 94%.

Explanation:

`(82+88+96+x)/(4) = 90\\ \\ (266+x)/(4) =90\\\\ 4((266+x)/(4)) =(90)4\\ \\ 266+x = 360\\ \\ 266+x-266 =360-266\\ \\ \\x = 94`

He must earn a 94% on his latest test for a test average of 90%