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# For each student in a certain class...

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Intern
Joined: 18 Nov 2018
Posts: 3
For each student in a certain class...  [#permalink]

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21 Mar 2019, 09:09
00:00

Difficulty:

(N/A)

Question Stats:

50% (00:15) correct 50% (00:52) wrong based on 2 sessions

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Question #151 from the 2019 OG

For each student in a certain class, a teacher adjusted the student's test score using the formula y=0.8x+20, where x is the student's original test score and y is the student's adjusted test score. If the standard deviation of the original test scores of the students in the class was 20, what was the standard deviation of the adjusted test scores of the students in the class?

A - 12
B - 16
C - 28
D - 36
E - 40

I was hoping someone may be able to provide another way to help solve this problem.
Math Expert
Joined: 02 Sep 2009
Posts: 55274
Re: For each student in a certain class...  [#permalink]

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21 Mar 2019, 09:14
SpruceMM wrote:
Question #151 from the 2019 OG

For each student in a certain class, a teacher adjusted the student's test score using the formula y=0.8x+20, where x is the student's original test score and y is the student's adjusted test score. If the standard deviation of the original test scores of the students in the class was 20, what was the standard deviation of the adjusted test scores of the students in the class?

A - 12
B - 16
C - 28
D - 36
E - 40

I was hoping someone may be able to provide another way to help solve this problem.

Discussed here: https://gmatclub.com/forum/for-each-stu ... fl=similar
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Re: For each student in a certain class...   [#permalink] 21 Mar 2019, 09:14
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