1) Approximately 20% of corporate workforce are not happy with their immediate bosses. Suppose 10 workers working in corporates are randomly selected.
a) What is the probability that everybody of them is happy with his immediate boss?
b) What is the probability that at least two of the workers are unhappy with their immediate bosses?
c) What is the probability that no more than two of the workers are unhappy with their immediate bosses?
Calculate the expected value and variance of the distribution.