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
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-> 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
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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) (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