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# The arithmetic mean and standard deviation of a certain

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Manager
Joined: 02 Oct 2007
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The arithmetic mean and standard deviation of a certain [#permalink]  28 Oct 2007, 10:45
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The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5 respectively. What value is exactly 2 standard deviations less than the mean.

A) 10.5
B) 11
C) 11.5
D) 12
E) 12.5
VP
Joined: 09 Jul 2007
Posts: 1108
Location: London
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Re: PS [#permalink]  28 Oct 2007, 11:00
JDMBA wrote:
The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5 respectively. What value is exactly 2 standard deviations less than the mean.

A) 10.5
B) 11
C) 11.5
D) 12
E) 12.5

13.5
std=1.5

2 standard deviations = 1.5*2=3

2 std less than the mean 13.5-3=10.5
A
Re: PS   [#permalink] 28 Oct 2007, 11:00
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