d. In the Binomial distribution with parameters 71 = 4 and p = 0.7, the expected value of X is E(X) = up = 4(0.7) = 2.8. Using the denition of the expected value of X with the pmf in b., show that the expected number of people among the survey participants who were involved in car accidents as a result of speeding is 2.8. e. In the Binomial distribution with parameters 71 = 4 and p = 0.7, the standard deviation of X is SD(X) = xp(1 p) = \\ /4(0.7) (0.3) % 0.9165. Using the denition of the standard deviation of X with the prnf in b., show that standard deviation of the number of people among the survey participants who were involved in car accidents as a result of speeding is about 0.9165