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Statistics and Sets Problems

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Statistics and Sets Problems

by swerve » Thu Oct 01, 2020 10:29 am

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Is the standard deviation of Set A greater than or equal to the standard deviation of Set B?

1) Set B can be formed by dividing each value in Set A by 4
2) Set A consists of 7 unique numbers

The OA is A

Source: Veritas Prep
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Source: — Data Sufficiency |
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Re: Statistics and Sets Problems

by DHRJ007 » Fri Oct 02, 2020 2:16 am

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1) standard deviation of set B will be one-fourth of set A.
so SDb < SDa
2) NOT SUFFICIENT



ans: A
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Re: Statistics and Sets Problems

by alishagmat » Fri Oct 02, 2020 4:02 am

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The rule of Standard deviation is that it gets multiplied/divided by the number say x, when each integer of the set is multiplied/divided respectively by x,

A) Hence standard deviation of B= 1/4 * standard deviation of A=
=> S.D. of B< S.D. of A

B) A can be greater than, equal to or less than B, all 3 cases possible, hence insufficient
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