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20 students from Mrs. Peterson’s English class take her fina
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15 Oct 2017, 22:55
15 Oct 2017, 22:55
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100% (01:16) correct
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20 students from Mrs. Peterson’s English class take her final, and score an average of 75 points. Mr. Chang, who is known for administering far easier tests, has 30 students, and they score an average of 95 points. If we combine the tests from the two classes what is the average score?
(A) 82
(B) 85
(C) 87
(D) 90
(E) Cannot be determined from information given.
Kudos for correct solution.
(A) 82
(B) 85
(C) 87
(D) 90
(E) Cannot be determined from information given.
Kudos for correct solution.
Re: 20 students from Mrs. Peterson’s English class take her fina
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15 Oct 2017, 23:36
15 Oct 2017, 23:36
This is a weighted average, where the weights are the number of students. Thus, the computations are \(\frac{20*75+30*90}{50} = 87\). Answer C
gmatclubot
Re: 20 students from Mrs. Peterson’s English class take her fina [#permalink]
15 Oct 2017, 23:36
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