Which of the following are probability distributions? Why?
(a)
RANDOM VARIABLE X PROBABILITY
2 ................... 0.1
–1 ................. 0.2
0 ................... 0.3
1 ................... 0.25
2 ................... 0.15
(b)
RANDOM VARIABLE Y PROBABILITY
1 ................... 1.1
1.5 ................... 0.2
2 ................... 0.3
2.5 ................... 0.25
3 ................... –1.25
(c)
RANDOM VARIABLE Z PROBABILITY
1 ................... 0.1
2 ................... 0.2
3 ................... 0.3
4 ................... 0.4
5 ................... 0.0