Solve clearly

14.7 Suppose that Y, follows the stationary AR(1) model Y, = 2.5 + 0.7Y-1+ up where u, is i.i.d. with E(u,) =0 and yar(u,) F 9. a. Compute the mean and variance of Y. (Hint: See Exercise 14.1.) b. Compute the first two autocovariances of Y. (Hint: Read Appendix 14.2.) music. Compute the first two autocorrelations of Y. d. Suppose that Yr = 102.3. Compute Yr+IT = E( Y,+1 YT, Y-1, ...)