Sorry, boss.
But getting standard deviation from a probability distribution would probably be best done by hand (of course, with the use of a computational device for those hard-to-reach fractions).
If your distribution question has a long line of events (IE, data points) then you'd probably want to use a more advanced calculator.
Nevertheless....I will return this afternoon with a more informed answer after I tinker with my BA-II Plus.
Whenever I do these, though, I usually pop open my TI89 Titanium (or of course just do it by hand).
STAY TUNED, MO...
MO MO....
GOOD NEWS & BAD NEWS.
I just finished messing around with the good old BA II Plus and this is what I've found:
GOOD NEWS:
You CAN find an unweighted mean & standard deviation.
BAD NEWS:
You CANNOT find a weighted standard deviation.
SORRY; judging by your question it seems as if you may have already come to this conclusion. The statistics menu on the BA II Plus just doesn't go into detail for a random variable like that.
However, you CAN use a TI Graphing Calculator to set up a few lists which will aide in discovering the standard deviation of a discrete random variable.
PEACE.
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