It is reported that 73% of men use computers. Choose 7 men at random. a. Find the probability that all 7 use a computer. b. Find the probability that at least 1 doesn't use a computer. 10. The Washington airport ranked 8 in major U.S. airports in on-time arrivals in the last quarter of 2008 with an 81.6% on-time rate. Choose 5 arrivals at random and find the probability that at least 1 was not on time. 10.