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

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Intern
Joined: 17 Jan 2017
Posts: 1
Each of the 4 students in a certain class read several books during  [#permalink]

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26 Feb 2017, 14:37
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Difficulty:

5% (low)

Question Stats:

93% (00:41) correct 7% (01:02) wrong based on 126 sessions

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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.
Math Expert
Joined: 02 Aug 2009
Posts: 7556
Re: Each of the 4 students in a certain class read several books during  [#permalink]

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26 Feb 2017, 17:25
1
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.
Insufficient

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

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