Q3(12). In a grocery store, for customers who purchased tomato, let X be the number of purchased tomato for one randomly selected customer, the probabil ity distribution for X is given below: 33(39) 0.1 0.5 0.2 0.2 1(8). Suppose two customers who purchase tomato are randomly selected. Find the probability distribution for the sample mean number of tomato purchased, X. 2(4). Find the mean, variance, and standard deviation of X