A sales representative sells life insurance policies to 5 men, each 30 years old. The probability is .8 that any 30 year old man will live for 20 more years. Let X denote the number of these men alive after 20 years.
A.) Graph the probability distribution of X
B.) Find the mean and varience of X. Use the general formulas for mean and variance and check results using the formulas u = np and o2 = npq.