Given X is a discrete binomial random variable with p = 0.3 and n = 20: (a) Can we use the normal approximation to estimate the binomial probability? (b) What if n is changed to 15? and (c) if n = 40...

Given X is a discrete binomial random variable with p = 0.3 and n = 20: (a) Can we use the normal approximation to estimate the binomial probability? (b) What if n is changed to 15? and (c) if n = 40 and p = 0.1 is the normal approximation appropriate?