Skylar's grades on four math tests are 85, 78, 77, and 69. What does Skylar need to score on the next test in order to have a mean score of 80? A) 83. B) 90. C) 91

Question

Makai Stewart

Mathematics

27 December, 01:43

Skylar's grades on four math tests are 85, 78, 77, and 69. What does Skylar need to score on the next test in order to have a mean score of 80? A) 83. B) 90. C) 91

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Answers (2)

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Rihanna Ayers · Answer 1

If Skylar's grades on four of her math tests are 85, 78, 77, and 69, she must score a 90 on the next text in order to have her mean score of 80. The answer will be A.

Lily Combs · Answer 2

(85 + 78 + 77 + 69 + x) / 5 = 80

(309 + x) / 5 = 80

309 + x = 80 * 5

309 + x = 400

x = 400 - 309

x = 91 < = = skylar needs to score a 91 to have an average of 80