Question

If the scores on previous tests were 84, 85, 87, and 99, what is needed on the next test to have a

90 average exactly?

Answer 1

95

Explanation:

Given data

Number of scores =5

84, 85, 87, and 99

Let the next score be x

Mean =90

So

Total score =84+85+87+99+x

Total score =355+x

Mean=total score /number of score

90=355+x/5

90*5=355+x

450=355+x

450-355=x

x=95