# Question

The probability distribution for the random variable x follows.

x f(x)

20 ......... .20

25 ......... .15

30 ......... .25

35 ......... .40

a. Is this probability distribution valid? Explain.

b. What is the probability that x = 30?

c. What is the probability that x is less than or equal to 25?

d. What is the probability that x is greater than 30?

x f(x)

20 ......... .20

25 ......... .15

30 ......... .25

35 ......... .40

a. Is this probability distribution valid? Explain.

b. What is the probability that x = 30?

c. What is the probability that x is less than or equal to 25?

d. What is the probability that x is greater than 30?

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