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Their answers revealed a mean of 8100000000 with a variance

A random sample of 42 salespersons were asked how long on average they were able to talk to a potential customer. Their answers revealed a mean of 8.100000000 with a variance of 6 minutes. Construct a 95% confidence interval for the time it takes a salesperson to talk to a potential customer.

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Mathematics: Their answers revealed a mean of 8100000000 with a variance

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