1. 7. The probability distribution for the random variable x follows. x f(x) 2223 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? 2. 16. The following table provides a probability distribution for the random variable y. a. Compute E(y). 1247X J(y) .20 .30 40 .10 Illustrate how you have done the calculation