For this probability distribution, the standard deviation of x is: X PIX) - 10 0.1 0 0.4 10 0.5 1) 10.0000 2) 44.0000 3) 6.6332 4) 3.1623 X follows a binomial distribution with n = 13 and p = 0.20. P(X=5) to four decimal places is: 1) 0.0735 2) 0.4118 3) 0.0691 4) 0.0001