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# Standard Deviation

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Manager
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Standard Deviation [#permalink]  12 Dec 2006, 04:38
Q) Is there any shortcut to this question....
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VP
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Std deviation is the swing (either positive or negetive) from the mean.

So if the values are as far as away from the mean the greater would become the std deviation of the set.

It it is close to the mean then the lesser is the overall std deviation.

So it is E here
Manager
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thanks guys...tvikram, u make it so easy....i need to remember all these things.....
Director
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SD = Sqrt[(m-x1)^2 + (m-x2)^2 + ... + (m-x100)^2]/100

where m = average(mean) i.e. 6

Now 6, 6 is the only which adds nothing to numerator but now that the demoninator is greater we have our new SD < d (original one)

So, E.
Senior Manager
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E - although almost seems a bit too obvious!
VP
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Most of the SD questions don't test the formula, but the concept of spread or "swing" from the mean/average. It is a little about common sense about the spread when you look at the numbers, so you can judge whether it widens or narrows.
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