The probability is 0.45 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 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.

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