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# The chart above represents the number of students at five schools, eac

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Math Expert
Joined: 02 Sep 2009
Posts: 47037
The chart above represents the number of students at five schools, eac [#permalink]

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12 Jan 2017, 00:10
00:00

Difficulty:

35% (medium)

Question Stats:

66% (00:44) correct 34% (01:01) wrong based on 102 sessions

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The chart above represents the number of students at five schools, each of which has branches in each of four towns. In which town is the standard deviation of the number of students at each school the least?

A. Town A
B. Town B
C. Town C
D. Town D
E. Cannot be determined.

Attachment:

2017-01-12_1108.png [ 17.61 KiB | Viewed 1289 times ]

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Director
Joined: 05 Mar 2015
Posts: 980
Re: The chart above represents the number of students at five schools, eac [#permalink]

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12 Mar 2017, 20:33
Bunuel wrote:
Bunuel wrote:

The chart above represents the number of students at five schools, each of which has branches in each of four towns. In which town is the standard deviation of the number of students at each school the least?

A. Town A
B. Town B
C. Town C
D. Town D
E. Cannot be determined.

Attachment:
2017-01-12_1108.png

BUMP................................

Town having least deviation from its mean position has the least SD

Town A= 217-95 = 122
Town B=156-99 =57
Town C= 204-148 =56
Town D=220-35 = 185

Since town C has less deviation it has least SD

Ans C
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Re: The chart above represents the number of students at five schools, eac [#permalink]

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12 Mar 2017, 21:56
Standard Deviation is the dispersion of elements from the mean position .
In Town C dispersion is the lowest i.e Maximum element- minimum element =204-148 =56
Re: The chart above represents the number of students at five schools, eac   [#permalink] 12 Mar 2017, 21:56
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