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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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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?

User Rahul Chaudhary
by
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1 Answer

5 votes
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 =
User Tom Morgan
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