The probability is 0.45 that a traffic fatality involves an intoxicated oralcohol-impaired driver or nonoccupant. In six trafficfatalities, find the probability that thenumber, Y, which involve an intoxicated oralcohol-impaired driver or nonoccupant is

a. exactlythree; at leastthree; at most three.

b. between two and four, inclusive.

c. Find and interpret the mean of the random variable Y.

d. Obtain the standard deviation of Y.

a. The probability that exactly three traffic fatalities involve an intoxicated oralcohol-impaired driver or nonoccupant is

nothing

.

(Round to four decimal places asneeded.)