**30.95%**acording to them.

I went to try to calculate this myself, first i got closing prices form yahoo finance:

FTSE 100 Historical Share Prices | ^FTSE | GB0001383545 | Yahoo! Finance UK

and worked out the % return for each day (return from the previous closing day) and applied the SD calculation, I got 1.8% for my answer. Does anyone know where I gone wrong?

What answer would you get?

2. Does anyone where i can get volatility data like this for the FTSE 100 without working it out myself?

Thanks