time series

Consider an M A(4) process with 91 = 0.6, 62 = 0.49, 93 = 0.264, and 94 = 0.072. Calculate the lag-3 autocorrelation, p3 = CorrO'r, 11-3): (Provide your answer to two decimal places. Do not write correlation as a percentage. i.e., do not write answers such as 83 or -67 because these should be 0.83 and 43.67.)