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Katrina must takefive exams in a math class. If her scores on the first four exams are 71,69,85, and 83, what score does she need

Katrina must takefive exams in a math class. If her scores on the first four exams are 71,69,85, and 83, what score does she need on her fifth exam for her overall mean to be

a)at least 70?( Give answer as whole number)

b)at least 80?( Give answer as whole number)

b)at least 90?( Give answer as whole number)

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