Math

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 ?

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  1. 500 * .8 = 400

    77 + 90 + 66 + 82 = 315

    400 - 315 = 85 needed on next test

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    Ms. Sue
  2. mean = ∑x/n

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

    Solve for x.

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  3. Lakita's test scores are 77, 86, 66, and 80. What score does she need on the last test in order to average 80 on her tests?

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