5.56 In the article cited in Exercise 5.55, the projected fatality rate for 1975 if the NMSL had not been in effect was 25 per 109 vehicle miles. Under these conditions,

a Find the probability of at most 15 fatalities occurring in 109 vehicle miles.
b Find the probability of at least 20 fatalities occurring in 109 vehicle miles.
c Compare the answers in parts

(a) and

(b) to those in Exercise 5.55.