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?

The probability for the random variable x follows.
x f(x)
20 ..........20
25 ..........15
30 ..........25
35 ..........40
a. Is this probability 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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