According to Accident Facts, published by the National Safety Council, a probability distribution of age group for drivers at fault in fatal crashes is as follows.
Age (yr) ____________________ Probability
16-24 .............................. 0.255
25-34 .............................. 0.238
35-64 .............................. 0.393
65 & over .......................... 0.114
Of three fatal automobile crashes, find the probability that
a. The drivers at fault in the first, second, and third crashes are in the age groups 16-24, 25-34, and 35-64, respectively.
b. Two of the drivers at fault are between 16 and 24 years old, and one of the drivers at fault is 65 years old or older.