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Mathematics, 05.07.2021 19:20 jomayrarivas1owj35x

A random sample of 64 door-to-door encyclopedia salespersons were asked how long on average they were able to talk to the potential customer. Their answers revealed a mean of 8.5 minutes. The population standard deviation is 3 minutes. Construct a 95% confidence interval for mu, the time it takes an encyclopedia salesperson to talk to a potential customer.
What is the upper confidence limit?

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