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Because her test turned out to be more diffi-cult than she
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16 May 2017, 08:32
16 May 2017, 08:32
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Question Stats:
64% (01:52) correct
35% (01:42) wrong based on 163 sessions
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Because her test turned out to be more difficult than she intended it to be, a teacher decided to adjust the grades by deducting only half the number of points a student missed. For example, if a student missed 10 points, she received a 95 instead of a 90. Before the grades were adjusted the class average was A. What was the average after the adjustment?
A) \(50 + \frac{A}{2}\)
B) \(\frac{1}{2}\) * \((100 - A)\)
C) \(100 -\) \(\frac{A}{2}\)
D) \(\frac{50 + A}{2}\)
E) \(A + 25\)
Sherpa Prep Representative
Joined: 15 Jan 2018
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Re: Because her test turned out to be more diffi-cult than she
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20 Jan 2018, 06:56
20 Jan 2018, 06:56
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The easiest way to do this question is by making up numbers. However, there's no need to make different numbers!
You have variables in the answer choices so you definitely want to find A and the plug it in, and it's an average question so you should immediately put down \(\frac{Sum}{Count=Avg}\)
We can make life easy for ourselves by saying there's only 2 people in the class so Count=2. We can say they're original score was both 90. The new scores would've been both 95.
Therefore, the new avg is simply 95!
Plug in 90 in the answer choices and see which gives you 95, which is A.
Just remember, variables in the answer choices don't do algebra. Plug and Chug!
Best,
Tae@SherpaPrep
You have variables in the answer choices so you definitely want to find A and the plug it in, and it's an average question so you should immediately put down \(\frac{Sum}{Count=Avg}\)
We can make life easy for ourselves by saying there's only 2 people in the class so Count=2. We can say they're original score was both 90. The new scores would've been both 95.
Therefore, the new avg is simply 95!
Plug in 90 in the answer choices and see which gives you 95, which is A.
Just remember, variables in the answer choices don't do algebra. Plug and Chug!
Best,
Tae@SherpaPrep
General Discussion
Re: Because her test turned out to be more diffi-cult than she
[#permalink]
18 Dec 2017, 17:47
18 Dec 2017, 17:47
please explain the answer?
