Question: Katrina must take five exams in a math class. If her scores on the first four exams are 72, 67, 86, and 84, what score

Katrina must take five exams in a math class. If her scores on the first four exams are 72, 67, 86, and 84, what score does she need on the fifth exam for her overall mean to be the following?

(a) at least 70

(b) at least 80

(c) at least 90

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