Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

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Basic Computation:
Distribution Suppose we have a binomial experiment in which success is defined to be a particular quality or attribute that interests us.
(a) Suppose n = 100 and p = 0.23. Can we safely approximate the
distribution by a normal distribution Why Compute
and
.
(b) Suppose n = 20 and p = 0.23. Can we Safely approximate the
distribution by a normal distribution Why or why not