A certain single-server system has been simulated, with the following sequence of waiting times before service for the respective customers. Use the regenerative method to obtain a point estimate and 90 percent confidence interval for the steady-state expected waiting time before service.

(a) 0, 5, 4, 0, 2, 0, 3, 1, 6, 0

(b) 0, 3, 2, 0, 3, 1, 5, 0, 0, 2, 4, 0, 3, 5, 2, 0