1. The probability density function of th a out of x thousand dollars on a certain assurance policy is given by fx(x) - 47K for 1 < x < co, where K is the monthy payment, in do , made on the policy. Policy
holders make monthy payments of either $30, $60 or $90.
The probability of a policy holder is making: the $30 payment is 4; the $60 payment is I; and the$90 payment is 3. Find the expected value of a payout.