The probability is 0.4 that a traffic fatality involves an intoxicated or alcohol-impaired driver or nonoccupant. In ten traffic fatalities, find the probability that the number, Y, which involve an intoxicated or alcohol-impaired driver or nonoccupant isa. 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.