The following table presents the probability mass function (pmf) oi the number of defects X in a randomly chosen printed circuit board. Plx) 0.5 0.3 0.1 0.1 a} Find the probability that at least two circuits are defective, P (X 2 2) : [Select] v b) Find the probability that one or more circuits are defective. [ P (X 2 1) : [Select] v c) In the long run, on average, the number of defective circuits is Em): [ Select] v