Question: 7. 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

7. 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?

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