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Which set(s) has the largest standard deviation? [#permalink]

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29 Aug 2010, 16:43

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A

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C

D

E

Difficulty:

25% (medium)

Question Stats:

81% (00:27) correct
19% (00:01) wrong based on 16 sessions

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Which set(s) has the largest standard deviation?

1. Set 1 consisting of 10 digits 2. Set 2 consisting of 10 first positive consecutive even numbers 3. Set 3 consisting of 10 first primes

set 1 set 2 set 3 sets 1 and 2 none

I did not understand why Set 1 is not the correct answer especially when nothing is known about Set 1. The digits in Set 1 can be even farther than the set consisting 10 forst primes. I think I am missing something?

Re: Which set(s) has the largest standard deviation? [#permalink]

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29 Aug 2010, 17:24

seekmba wrote:

Which set(s) has the largest standard deviation?

1. Set 1 consisting of 10 digits 2. Set 2 consisting of 10 first positive consecutive even numbers 3. Set 3 consisting of 10 first primes

set 1 set 2 set 3 sets 1 and 2 none

I did not understand why Set 1 is not the correct answer especially when nothing is known about Set 1. The digits in Set 1 can be even farther than the set consisting 10 forst primes. I think I am missing something?

sd is the DISPRESION of the terms.... the distance between SET 1 and 2 is fixed therefore the dispression is fixed.... but for set 3, the distance between terms vary, therefore more dispression therefore more SD

Re: Which set(s) has the largest standard deviation? [#permalink]

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29 Aug 2010, 20:41

1. This set probably has digits 0..9. The max STD Dev possible here is if the set has 0 and 9s half and half I guess.. 2. STD =0 3. [ 3 5 7 11 13 17 19 23 29 31] max sd

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