please help me solve this

Risk Premium and Certainty Equivalent > Exercise Consider an investor with income Y = 50000 and utility function of the constant relative risk aversion form Y1'7 1-7 who is considering buying an asset with random payoff Z that equals 2000 with probability 1/2 and 0 with probability 1/2. uCY) = where y = 5, Calculate: a. E(Z) and 02(2) b. 1/J(Z) by using our approximate formula c. The exact value of 1/J(Z)