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?

95

Step-by-step 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

not solvable

step-by-step explanation:

we need more information, or at least an

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step-by-step explanation: