x P(X= The number of customers per day for a car retailer is distributed as below: 0 1 2 3 4 0.28 0.14 0.04 0.02 = x) 0.52 Find the a) Expected value E[X], b) Variance and standard deviation of customers per day. c) If the profit per customer (Y) can be expressed as Y-300X+100 $, what is the expected value and variance of Y?