This is a binomial distribution: either you miss the flop or you don't.
If your probability to NOT miss is .32, then your probability to miss is 1 - .32 = .68.
Your number of trials is 22. The expected number of missing is 22 * .68 = 14.96.
The variance of the binomial distribution is np(1-p). In your case, 22*.68*(1-.68) = 4.7872. The standard deviation ...