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: a.? ?What is the pmf of ?X?? b.? ?Using just the cdf, compute P(3 ? X ? 6) and P( 4 ? X).

Answer : Step 1 of 3 : Given, 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: Step 2 of 3 : a) The claim is to find the probability mass function of the cumulative density function