probability distribution

Question

The probability distribution for a random variable x is given in the table.

X: -10,-5,0,5,10,15,20

Probability: .20, .15, .05, .1, .25, .1, .15

find the probability that x≤20

Answer 1

The required probability is 1.

x can only assume values ≤ 20, i.e. it is a certainty (probability=1) that x will be ≤20!