# Can you explain Standard Deviation please.

Question asked by: Stinkabell

Asked on: 28 Dec 2008

This number tells you how a set of numbers vary with regard to the mean.

For instance if you have the numbers 1, 2, 2, 3 then you first find the mean, which here is 2.

We then find how each deviates from the mean,

e.g. 1 - 2, 2 - 2, 2 - 2, 3 - 2

and square each of these, to get 1,0,0,1.

Then find the mean of these, which is 0.5. The square root of this is the standard deviation (g here 0.707).

Now just apply the above steps to your numbers to get the standard deviation in that case.

By: knowitall

Replied at: 04 Jan 2009

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Next question: Given that y is inversely proportional to (x-1).
(a)write down an expression for y in terms of x and a constant k.
(b)it is given that y=5 when x=3. find x when y=25.

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