What is a Probability Distribution?
6. Determine whether each of the distributions given below represents a probability distribution. Justify your answer. (a) x 1 2 3 4 P(x) 1/4 1/12 1/3 1/6 (b) x 3 6 8 P(x) 0.2 2/5 0.3 (c) x 20 30 40 50 P(x) 3/10 -0.1 0.5 0.3