# The first three test scores of each of the four students are shown. each test is 100 points. each student hopes to maintain a mean score of 85. find the score needed by each student on the fourth test to have a mean score of 85, or explain why such value is not possible. a. lisa: 78, 80, 100 b. mary: 90, 92, 95 c. lina: 79, 80, 81d. willie: 65, 80, 80

Answers: 1

## Answers

The first three test scores of each of the four students are shown. each test is 100 points. each st...

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(85 × 4) - (100 × 3)

340 - 300

40

CHECK:

[(100 × 3) + 40] ÷ 4 = 85

[300 + 40] ÷ 4 = 85

340 ÷ 4 = 85

85 = 85

TRUE