A parent-teacher committee consisting of 4 people is to be formed from 20 parents and 5 teachers. Find the probability that the committee will consist of these people. (Assume that the selection will be random.) (a) All teachers (b) 2 teachers and 2 parents A package contains 12 LCD panels, 3 of which have defective pixels. If 4 LCD panels are selected, find the probability of getting 1 defective LCD panel. Determine whether the following are legitimate probability distributions. (a) x -2 0 2 4 P(x) 0.25 0.5 0.25 0 (b) x 0 1 2 P(x) 0.3 -0.1 0.8