SOLUTION: A student’s mean score after 4 quizzes was 72. After the fifth quiz, the mean increased to 75.What was the student’s score on the fifth quiz? (A) 60 (B) 72 (C) 84 (D) 87 (E) 1

Algebra ->  Average -> SOLUTION: A student’s mean score after 4 quizzes was 72. After the fifth quiz, the mean increased to 75.What was the student’s score on the fifth quiz? (A) 60 (B) 72 (C) 84 (D) 87 (E) 1      Log On


   



Question 329398: A student’s mean score after 4 quizzes was 72. After the fifth quiz, the mean increased to 75.What was the student’s score on the fifth quiz?
(A) 60 (B) 72 (C) 84 (D) 87 (E) 100

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A student’s mean score after 4 quizzes was 72. After the fifth quiz, the mean increased to 75.What was the student’s score on the fifth quiz?
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Fact: (sum of scores)/(# of scores) = average of scores
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Sum after 4 quizzes = 4*72 = 288
Sum after 5 quizzes = 5*75 = 375
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Score on the 5th quiz = 375-288 = 87
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Cheers,
Stan H.
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(A) 60 (B) 72 (C) 84 (D) 87 (E) 100