Determine whether each of the following is a valid probability distribution.

Question

a) X: 0, 2, 2, 3
P(x): .1, .3, .4, .1

b) X: 5, -6, 10, 0
P(x): .01, .01, .01, .97

c) X: 14, 12, -7, 13
P(x): .25, .46, .04, .2

Answer 1

If these are all the scores in the distribution, the sum of their probabilities = 1.