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Standard deviation comparison [#permalink]
31 Aug 2016, 00:07

00:00

Question Stats:

100% (00:26) correct
0% (00:00) wrong based on 3 sessions

Quantity A

Quantity B

Standard Deviation of 16, 5, 14, 5, 8, 16

Standard Deviation of 6, 8, 18, 14, 18, 8

A)The quantity in Column A is greater. B)The quantity in Column B is greater. C)The two quantities are equal. D)The relationship cannot be determined from the information given.

Re: Standard deviation comparison [#permalink]
16 Sep 2017, 23:20

1

This post received KUDOS

I don't know if this is the fastest way to do it but I've used the "informal definition" of standard deviation of Greenlight Test Prep, i.e. the standard deviation is the mean of the distance of data values from the mean. Thus, we have that column A has a mean of 32/2 = 10.67 and column B has a mean of 12. Then, computing the distance for each value from the mean I get that the approximate standard deviation of column A is equal to 4.44, while for column B it is 4.67. Thus, the answer is B!