How to find probability of a value in skewed data?

4.5k Views Asked by At

I have some data which is positively skewed $(0.9)$ and I would like to be able to find the probability of a given value. With normally distributed data I know that $68\%$ of data is within one standard deviation etc. and you can use a probability table to work out a value's probability. However, is there a way to do this with skewed data? Any help would be appreciated, thanks in advance!