Mathematics, 31.05.2021 22:20 Mypasswordishotdog11

Trent wants a MEAN grade of 90% or better on his mathematics test. His test grades so far are 85%, 88%, 92%, and 90%. What is the lowest grade he can get on his next test and still have a mean grade of 90%?

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Trent wants a MEAN grade of 90% or better on his mathematics test. His test grades so far are 85%, 8...