Standard Deviation 24.4 BB/100

[DougOzzzz]

Over a pretty small sample size of 6000 hands, I have a standard deviation of 24.4 BB/100. I checked a previous thread and saw that 15 is about normal, and there seems to be a very small "standard deviation" for standard deviation. Hah. About 1/3 of my hands have been 6 max tables... I am not loose (18% VP$IP at 10 handed tables), nor super aggressive (2.5 post flop aggression). Any other reasons my standard deviation is so high? Is it just a result of the small sample size? Oddly enough, my daily win rate seems to have a very low SD...

How valid is a 6000 hand history anyways? If I am at X BB/100 with an SD of Y after Z hands, whats the standard deviation for "actual" BB/100 for that player?

Thanks for any help...