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kolezko [41]
4 years ago
9

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 me

an score of 80? A) 83. B) 90. C) 91
Mathematics
2 answers:
Mandarinka [93]4 years ago
8 0
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. 
ExtremeBDS [4]4 years ago
5 0
(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
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