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Here are four grades: HW = 80, test = 75, project = 90, quiz = 85...

Here are four grades: HW = 80, test = 75, project = 90, quiz = 85 . (a) What is the mean? (b) What is the medium?   (c) What is the weighted meean assuming these weights: HW 15%, test 20%, project 15%, and quiz 15%.

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