The probability distribution for the random variable x follows.  Show Steps in Excel x                                     f(x) 20                                0.2 25                                0.15 30                                0.25 35                                 0.4 a Is the probability distribution valid? 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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