Mathematics, 18.02.2021 17:30 aiueo946

A student must have an average (the mean) on five tests that is greater than or equal to 80% but less than 90% to receive a final grade of B. Devon's grades on the first four tests were 77%, 63%, 90%, and 78%. What range of grades on the fifth test would give him a B in the course? (Assume that 100% is the highest grade possible.)

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A student must have an average (the mean) on five tests that is greater than or equal to 80% but l...

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