X have a binomial distribution with 20 trials and p=0.6
a.1.P(X小于等于12) 2.P(X=12) 3.P(X大于等于12)
bFind the Expected value and Variance of X
c.Is it possible to use the normal aprroximation to binomial distroution in this case, why?
d.Approximate P(X小于等于12)using the normal distribution. how does this compare to your answer in part a1 ?
