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# 20 students from Mrs. Peterson’s English class take her fina

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Joined: 20 May 2014
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20 students from Mrs. Peterson’s English class take her fina [#permalink]  15 Oct 2017, 22:55
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100% (00:28) correct 0% (00:00) wrong based on 3 sessions
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.
[Reveal] Spoiler: OA
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Joined: 03 Sep 2017
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Kudos [?]: 343 [0], given: 66

Re: 20 students from Mrs. Peterson’s English class take her fina [#permalink]  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
Re: 20 students from Mrs. Peterson’s English class take her fina   [#permalink] 15 Oct 2017, 23:36
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# 20 students from Mrs. Peterson’s English class take her fina

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