A manager of a cafeteria wants to estimate the average time customers wait before being served. A random sample of 49 customers has an average waiting time of 8.4 minutes with a standard deviation of 3.5 minutes. Find a 90% confidence interval for the true average customer waiting time. O (8.21, 8.56) (8.26, 8.54) (7.58, 9.23) O (8.33, 8.47)

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