Jacob has a mean score of 78 after his first four math tests. He wants to make a B, or an average of 80, in math. What does he need to score on the fifth test to have a mean score of 80?A.

Question

82

B.
88

C.
94

D.
108

Answer 1

Let x be the score on the fifth test.
The sum of the scores on the first four tests is 78 * 4 = <<78*4=312>>312.
The total sum of the scores after the fifth test is 312 + x.
The mean score after the fifth test is (312 + x) / 5 = 80.
So 312 + x = 400.
Therefore, the score Jacob needs to get on the fifth test is x = 400 - 312 = 88.
Thus, the answer is B.