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On his first biology test, Bob received the following scores: 72, 86, 92, 63, and 77. What test score must Bob earn on his sixth test so that his average (mean score) for all six tests will be 80?

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hilolz123

Answer:

90

Step-by-step explanation:

Create an equation where all the numbers are added together and divided by 6 to equal 80:

[tex]\frac{72+86+92+63+77+x}{6} = 80[/tex]

Simplify and solve for x:

[tex]\frac{390 + x}{6} = 80[/tex]

[tex]390 + x = 480[/tex]

[tex]x = 90[/tex]

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