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word problem

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by thephoenix » Sat Jan 30, 2010 10:53 pm
Mean = 21 hours
SD = 6
One or Two SD below mean is

Mean - 1 ( SD ) = 21 -6 = 15
Mean - 2 ( SD) = 21 - 12 = 9

9 < n < 15

Ans n =12
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by ajith » Sat Jan 30, 2010 11:40 pm
armaan700+ wrote:word problem is stumbling me
The answer is 1-2 SD below the mean
Mean =12 SD = 6
=> Answer is between 9 and 15 .. only one choice is between 9 and 15
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