2. The following density function describes the random variable X. 0≤x≤5 a. D. c. d. X f(x) = a 10-x 5≤x≤10 a What is a? What is the probability that X lies between 4 and 8? Compute the probability that X is less than 7. Find the mean of X, E(X), and the variance of X, V(X).

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