A city Law-enforcement official has stated that 20% of the items sold by a pawn shops within the city have been stolen. Ralph has just purchased 4 items from one of the city’s pawn shops. Assuming that the official is correct, and for x= the number of Ralph’s purchases that have been stolen, determine the following a. P(x=0) b. P(2? x) c. P(1? x? 3) d. P(x? 2) Determine the (a) Mean , (b) Variance and (c) Standard deviation of the following discrete probability distribution x 0 1 2 P(x) 0.60 0.30 0.10