Explicate probability using discrete distribution
describe the probability distribution for the random variable x follows
X

f(x)

20

0.2

25

0.15

30

0.25

35

0.4

1) Is this probability distribution valid? describe
2) What is the probability that x = 30?
3) What is the probability that x is less than or equal to 25?
4) What is the probability that x is greater than 30?