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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

User Fischer
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2 Answers

5 votes

Answer:

91

Explanation:

User Johhny B
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2 votes
(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
User Hossein Mousavi
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