6. Suppose there are three defective items in a lot (col- lection) of 50 items. A sample of size ten is taken at random and without replacement. Let X denote the number of defective items in the sample, (a) State the pmf of X? (b) Calculate the M, 02 and o. (c) Find the probability that the sample contains exactly one defective item. (d) What is the probability that the sample contains at most one defective item? 5