5) In one city, 21% of the population is under 25 years of age. Three people are selected at random from the city. Find the probability distribution of X, i.e., the number among the three that are under 25 years of age. 6) A die is rolled 18 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the mean and standard deviation for the random variable X, the number of twos