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 sc

Question

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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3 weeks 2021-10-01T04:09:32+00:00 1 Answer 0

Answers ( )

  1. Charlotte
    0
    2021-10-01T04:10:54+00:00

    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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