Approximately 20% of U.S. workers are afraid that they will never be able to retire

(bankrate.com, June 23, 2008). Suppose 10 workers are randomly selected.

a. W hat is the probability that none of the workers is afraid that they will never be able to retire?

b. W hat is the probability that at least two of the workers are afraid that they will never be able to retire?

c. W hat is the probability that no more than two of the workers are afraid that they will never be able to retire?

d. Calculate the expected value, the variance, and the standard deviation of this binomial probability distribution. L05