Question

Help on question 32 please

Answer 1

90

Explanation:

The mean is measured as

mean =
`(score)/(count)`

After 5 tests the mean is 84, that is

`(score)/(5)` = 84 ( multiply both sides by 5 )

score = 420

let the sixth test score be x, then

`(420+x)/(6)` = 85 ( multiply both sides by 6 )

420 + x = 510 ( subtract 420 from both sides )

x = 90

Require to score 90 on the sixth test