hi daniel 27
sorry to hear about your loss
your figures
win rate - $334 - i am assuming this is your hourly win rate?
SD - $2,804 - i am assuming this is your hourly SD rate?
you played 3 hours.
Loss of 700 units - assuming this means $7,000?
if my assumptions are correct then the number of hands that you played dont matter (since they already go into calculating your win rate). Your ROR and BR are also irrelevant for calculating the likelihood of losing $7,000.
for 3 hours:
your EV would be 3 x 334 = $1,002
your SD would be sqrt(3) x $2,804 = $4,857
thus a result 1 std dev below EV would be $1,002 - $4,857 = -$3,854
thus a result 2 std dev below EV would be $1,002 - (2x$4,857) = -$8,711
Thus a loss of $7k would be well within just 2 standard deviations.
In percentage terms, the chance of losing $7,000 or more would be 4.97% (using the normal distribution formula in MS Excel).
Hope that helps.
Matt