Let X and Y be continuous random variables and. Let (X, Y) be a joint random variable with the joint probability density function (pdf), the value c is constant and unknown: f(x, v) = { 0srsys 2. else a. What value of c is needed to ensure that the joint pdf is valid? b. What is the probability that X is greater than 0.5 and Y is less than 3? c. Find the expected value of X

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