Standard Deviation Question

I just calculated my standard deviation over the last 87 sessions. I've never done this before and am not sure that I did it accurately.


I play 9/18 HE, made 1.87 BB/hour for 87 sessions, 650 hours total - SD of 705. This seems high to me, but I don't really know, maybe it's accurate. If anyone is willing to take a look at my spreadsheet and check my numbers, please let me know - I can email it to you.


Also, if you think this number is reasonable or unreasonable, please feel free to let me know what the reasonable range is.


Thanks,


soda