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Each of the 4 students in a certain class read several books during

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Each of the 4 students in a certain class read several books during [#permalink]

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Each of the 4 students in a certain class read several books during the past month. What was the standard deviation of the numbers of books read by the 4 students during the past month?

1) The range of the number of books read by the 4 students during the past month was 0.

2) One of the 4 students read 5 books during the past month.
[Reveal] Spoiler: OA

Kudos [?]: 1 [1], given: 72

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Joined: 02 Aug 2009
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Kudos [?]: 5832 [1], given: 117

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Each of the 4 students in a certain class read several books during the past month. What was the standard deviation of the numbers of books read by the 4 students during the past month?
So we are looking for the spread of the numbers

Let's see the statements..

1) The range of the number of books read by the 4 students during the past month was 0.
If range is 0, all the numbers will be SAME. So spread is 0..
Sufficient

2) One of the 4 students read 5 books during the past month.
Nothing about others
Insufficient

A
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Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Kudos [?]: 5832 [1], given: 117

Director
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Kudos [?]: 36 [0], given: 165

Re: Each of the 4 students in a certain class read several books during [#permalink]

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New post 10 Sep 2017, 22:13
gmatoptimist wrote:
Each of the 4 students in a certain class read several books during the past month. What was the standard deviation of the numbers of books read by the 4 students during the past month?

1) The range of the number of books read by the 4 students during the past month was 0.

2) One of the 4 students read 5 books during the past month.


whenever the range of a set is 0 the standard deviation is always 0

A

Kudos [?]: 36 [0], given: 165

Re: Each of the 4 students in a certain class read several books during   [#permalink] 10 Sep 2017, 22:13
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