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# Request for a Visualization of an Answer

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Intern
Joined: 18 Nov 2018
Posts: 3

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19 Mar 2019, 10:41
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I have perhaps a rather elementary question but I was hoping someone may be able to assist me in visualizing the answer to question #166 from the 2019 OG:

"A certain characteristic in a large population has a distribution that is symmetric about the mean (m). If 68% of the distribution lies within one standard deviation (d) of the mean, what percent of the distribution is less than m+d?"

A - 16%
B - 32%
C - 48%
D - 84%
E - 92%

I attempted to answer the question by adding the mean (50%) and the std dev (68%) but of course that is not correct. I then took half the std dev (34%) added it to the mean and got 84%. The difference between 100% and 84% is 16% and I selected (A) on that basis. I apparently misread the question and am currently having a difficult time conceptualizing what the question is asking.

Your assistance would be greatly appreciated!

*Thank you for taking the time to read this post*
Math Expert
Joined: 02 Sep 2009
Posts: 55150

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19 Mar 2019, 10:43
SpruceMM wrote:
I have perhaps a rather elementary question but I was hoping someone may be able to assist me in visualizing the answer to question #166 from the 2019 OG:

"A certain characteristic in a large population has a distribution that is symmetric about the mean (m). If 68% of the distribution lies within one standard deviation (d) of the mean, what percent of the distribution is less than m+d?"

A - 16%
B - 32%
C - 48%
D - 84%
E - 92%

I attempted to answer the question by adding the mean (50%) and the std dev (68%) but of course that is not correct. I then took half the std dev (34%) added it to the mean and got 84%. The difference between 100% and 84% is 16% and I selected (A) on that basis. I apparently misread the question and am currently having a difficult time conceptualizing what the question is asking.

Your assistance would be greatly appreciated!

*Thank you for taking the time to read this post*

Discussed here: https://gmatclub.com/forum/a-certain-ch ... 43982.html

Please follow the rules when posting a question: https://gmatclub.com/forum/rules-for-po ... 33935.html Thank you.
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Re: Request for a Visualization of an Answer   [#permalink] 19 Mar 2019, 10:43
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