Suppose we want to estimate the expected average waiting time for the first m = 100 customers at a bank. We make r = 4 independent replications of the system, each initialized empty and idle and consisting of 100 waiting times. The resulting replicate means are: 1 2 3 4 Z4 5.2 4.3 3.1 4.2 Find a 90% confidence interval for the mean average waiting time for the first 100 customers. O [4.2,4.3] O [3.188,5.212] O 4.2 O 3.5 + 2 O 4.21 2