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Which of the following sets has the standard deviation

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Which of the following sets has the standard deviation [#permalink]

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Which of the following sets has the standard deviation greater than the standard deviation of set X={-19, -17, -15, -13, -11}

I. A={1, 3, 5, 7, 9}

II. B={2, 4, 6, 8, 10}

III. C={1, -1, -3, -5, -7}

A. Set A only
B. Set B only
C. Set C only
D. Sets A, B and C
E. None of the sets

m05 q07
[Reveal] Spoiler: OA

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Re: Which of the following sets has the standard deviation [#permalink]

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New post 29 Apr 2012, 03:02
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monir6000 wrote:
Which of the following sets has the standard deviation greater than the standard deviation of set X={-19, -17, -15, -13, -11}

I. A={1, 3, 5, 7, 9}

II. B={2, 4, 6, 8, 10}

III. C={1, -1, -3, -5, -7}

A. Set A only
B. Set B only
C. Set C only
D. Sets A, B and C
E. None of the sets

m05 q07


If we add or subtract a constant to each term in a set the standard deviation will not change.

Since each set can be obtained by adding some constant to each term of set X (20 for set A, 21 for set B and 12 for set C), then the standard deviations of all sets are the same.

Answer: E.
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Re: Which of the following sets has the standard deviation [#permalink]

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Re: Which of the following sets has the standard deviation [#permalink]

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New post 17 Mar 2017, 08:49
Hello from the GMAT Club BumpBot!

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Re: Which of the following sets has the standard deviation   [#permalink] 17 Mar 2017, 08:49
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