The probability distribution for the random variable x follows. f(x) 20 0.30 25 0.05 30 0.25 35 0.40 (a) Is this probability distribution valid? Explain. Since f(x) ? O O for all values of x and ) f(x) = , this ---Select--- O a proper probability distribution. (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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