Question

Question #3ef43

Answer 1

New mean `= 94.3`

Explanation:

The formula to calculate mean is:

`"Mean" = "Total of values"/"number of values" " "M = T/N`

This means we also have the formulae

`T = MxxN and N = T/M`

If the mean of 6 tests was `95`, then the total was:

`T=90xx6 = 570`

If the student writes another test, the total will increase and the number of tests increases.

New total`= 570+90 =660`

New number `= 6+1 = 7`

We expect the new mean to be lower, because the last test score was less than the average for the first `6`.

`Mean = 660/7 =94.2857`

`Mean = 94.3`