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7 January, 21:43

The mean of Holly's first six math quiz scores was 75%. After taking the seventh quiz, her

mean score rose to 77%. What was Holly's score on the seventh math quiz?

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  1. 7 January, 21:51
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    The total of her first six quizzes is 75*6 = 450

    Let her seventh score be x

    The total of her seven quizzes be 450+x

    Then, (450+x) / 7 = 77

    x = (77*7) - 450 = 89

    Her seventh score is 89

    x =
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