find the mean, varince, standard deviation of the binomial distribution with the valudes being n and p n=126 p=0.31 what is the mean? round to the nearest tenth what is the varience? what is the standard deviation? Solution mean of binomial distribution = n*p= 126*0.31=39.06 variance= n*p*(1-p)= 39.06*0.69=26.95 standard dev= sqrt(variance)= 5.19 http://en.wikipedia.org/wiki/Binomial_distribution.