The probability is 0.3 that a traffic fatality involves an intoxicated or alcohol-impaired driver or nonoccupant. In eight traffic fatalities, find the probability that the number, Y, which involve an intoxicated or alcohol-impaired driver or nonoccupant is a. exactly three; at least three; 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.