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11 December, 20:44

Katherine earned 84, 92, 84, 75, and 70 on her five math tests.

What is the minimum grade Katherine needs to earn on the next test to have a mean of 84?

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  1. 11 December, 21:26
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    Katherine's marks = 84,92,84,75,70

    Total marks = 84+92+84+75+70 = 405

    No. of observations = 5

    Mean = Total sum of observations/No. of observations

    Mean = 405/5=81

    Expected mean = 84

    Let expected total marks be = n

    84=n/5

    84*5=n

    n=420
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