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1 May, 06:20

Imena's math test scores are 83, 93, 78, 89, and 83. She has one more math test this semester. What score most she get on the test to have a median score of 85?

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  1. 1 May, 07:00
    0
    Mean = (83 + 93 + 78 + 89 + 83 + x) / 6

    85 = (426 + x) / 6

    Multiply both sides by 6 to remove the denominator on the RHS of the equation

    85 * 6 = [ (426 + x) / 6] * 6

    510 = 426 + x

    510 - 426 = x

    84 = x

    x = 84

    She has to get a score of 84 to have a median score of 85.
  2. 1 May, 07:02
    0
    87 is the median because 83 and 87's average is 85.
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