. The radius R of a certain disk is a continuous random variable with pdf fR(r) = 3r 2 125, where 0 < R < 5. R (0, 0) (R, 0) (a) What is the probability that 3 < R < 4? (b) Find and simplify a formula for the cdf FR(r) of the random variable R. (c) What is the expected value E(R)?

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