Question

Questio

Matteo scored 85 on their first test, 89 on their second test, 85 on their third test, and
89 on their fourth test. Suppose Matteo has one more test in the semester and wants
to finish with a mean score of 88.

What score do they need on their last test to finish with a mean score of 88?

Answer 1

He needs 92 on his last test.

Explanation:

Mean score:

The mean is the sum of all scores divided by the number of tests.

In this question:

Scores of 85, 89, 85, 89 and x(the last one).

5 tests.

We want a mean of 88. So we find x for a mean of 88.

`(85 + 89 + 85 + 89 + x)/(5) = 88`

`348 + x = 440`

`x = 440 - 348 = 92`

He needs 92 on his last test.