Recall that when appropriate, a binomial random variable can be approximated by a normal random variable that has the same mean and standard deviation as the binomial random variable. In other words, when appropriate, a binomial random variable with n trials and probability of success p, can be approximated by a normal distribution with mean μ = np and standard deviation σ = sqrt( np (1 - p) ).

For those binomial distributions in questions 1-4 of the previous exercise for which the normal approximation is appropriate, write down which normal distribution you would use to approximate them.