Question

Hello, do you know where I can find the standard deviation of the S&P 500 index for 2010

Answer 1

Standard deviation can be found an i number of different ways:

One being:
\[\sigma=\sqrt{\frac{\color{green}{\sum}{\color{purple}{(x-\mu)^2}}}{\color{red}{N}}}\]
for large amounts of data tho a more convenient form is this:
\[s=\sqrt{\frac{n(\sum{(x^2)})-(\sum{x})^2}{n(n-1)}}\]
where n=the number of items in your data. and x=each value of data

Answer 2

where to find this already? dunno, google maybe

Answer 3

http://www.moneychimp.com/features/market_cagr.htm