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A sample of 80 customers of a certain bank branch last week showed a mean waiting time of 5.4 minutes and standard deviation of 28.

A sample of 80 customers of a certain bank branch last week showed a mean waiting time of 5.4 minutes and standard deviation of 28. Find a 95% confidence interval for the true average waiting time. (6.01;6.79) (5.01:5.79) (5.79:7.01) (4,79;6.01)

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