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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

Question

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?

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Mathematics
6 months
2021-07-27T11:20:13+00:00
2021-07-27T11:20:13+00:00 2 Answers
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## Answers ( )

It is given that,

The mean is the average of 5 numbers.

Then if the,

Next score is x the mean will be.

We can solve now,

→ (85 +78 +77 + 69 + x)/5 = 80

→ (309 + x)/5 = 80

→ 309 + x = 80 × 5

→ 309 + x = 400

→ x = 400 – 309

→ x = 91

Hence, the next score is 91.

Answer:Step-by-step explanation:The mean the the average of 5 numbers. If the next score is x, then the mean is:Solve it for x: