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

Exercise 37

Basic Computation: Expected Value and Standard Deviation Consider a binomial experiment with n = 20 trials and p = 0.40.
(a) Find the expected value and the standard deviation of the distribution.
(b) Interpretation Would it be unusual to obtain fewer than 3 successes Explain. Confirm your answer by looking at the binomial probability distribution table.