Otod7971 Otod7971

13-10-2018
Mathematics

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Rosa's test scores are 78, 92, 88, and 89. What must she score on her next test to have an average of 90? A) 95 B) 97 C) 99 D) 103

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tramserran tramserran

13-10-2018

Answer: D

Step-by-step explanation:

Let x represent the score on her next test

[tex]\frac{78 + 92 + 88 + 89 + x}{5} = 90[/tex]

[tex](5)\frac{78 + 92 + 88 + 89 + x}{5} = (5)90[/tex]

78 + 92 + 88 + 89 + x = 5(90)

347 + x = 450

-347 -347

x = 103

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