3. An insurance company offers its policyholders a number of different premium payment options. For a randomly selected policyholder, let X= the number of months between successive payments. The cdf of X is as follows: x<1 15x<3 3sx<4 4sx<6 0.30 0.40 F(x) = 0.45 0.60 65x< 12 1 12 < x a. Graph the cdf F(x). b. What is the pmf of X? c. Compute P(3

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