The manager of a grocery store has taken a random sample of 144 customers. The average length of time it took these 144 customers to check out was 3 minutes. It is known that the standard deviation of the population of checkout times is 1 minute. The 95% confidence interval for the true average checkout time (in minutes) is
A. 2.863 to 3.137.
B. 1.36 to 4.64.
C. 1 to 5.
D. 2.837 to 3.163.
Answer: D
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