Math

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Desiree's test score are 77,90,66 and 82.what score does she need on the last test in order to average 80 on her tests ?

  • Math -

    500 * .8 = 400

    77 + 90 + 66 + 82 = 315

    400 - 315 = 85 needed on next test

  • Math -

    mean = ∑x/n

    80 = (77+90+66+82+x)/5

    Solve for x.

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