raising your grade. Suppose you have scores of 80, 84, 87, and 89 on quizzes in a

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raising your grade. Suppose you have scores of 80, 84, 87, and 89 on quizzes in a mathematics class.

a. What is the mean of these scores?

b. What score would you need on the next quiz to have an overall mean of 88?

c. If the maximum score on a quiz is 100, is it possible to have a mean of 90 after the fifth quiz? Explain.

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