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In a normally distributed set of data, the mean is 12 and th

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In a normally distributed set of data, the mean is 12 and th [#permalink] New post 29 Jul 2018, 04:35
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In a normally distributed set of data, the mean is 12 and the standard deviation is less than 3.

Quantity A
Quantity B
The number of data points in the set between 9 and 15
60% of the total number of data points


A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

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Re: In a normally distributed set of data, the mean is 12 and th [#permalink] New post 03 Aug 2018, 04:37
In a normally distributed dataset. 68% of data lie within 1 sd of the mean. Since 1sd is less than 3. Given that mean is 12 the no of data between 9 and 15 will be more than 68%. Hence option A

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Re: In a normally distributed set of data, the mean is 12 and th   [#permalink] 03 Aug 2018, 04:37
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In a normally distributed set of data, the mean is 12 and th

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