according to a survey by the Administrative management Society, one-half of U. companies give employees 4 weeks of vacation after they have been with...

according to a survey by the Administrative management Society, one-half of U.S. companies give employees 4 weeks of vacation after they have been with the company for 15 years. Find the probability that among 6 companies surveyed at random, the number that give employees 4 weeks of vacation after 15 years of employment is (a) Anywhere from 2 to 5;(b) fewer than 3.