44. From 1990 through 1999, an average of approximately 26 aircraft accidents per year involved one or more passenger fatalities. Since 2000, the average decreased to 15 accidents per year (The World Almanac and Book of Facts, 2004). Assume that aircraft accidents continue to occur at the rate of 15 per year.

a. Compute the mean number of aircraft accidents per month.

b. Compute the probability of no accidents during a month.

c. Compute the probability of exactly one accident during a month.

d. Compute the probability of more than one accident during a month.