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The average number of customers that visited a particular store during the past year is 160 per day and a standard deviation of 25 customers

The average number of customers that visited a particular store during the past year is 160 per day and a standard deviation of 25 customers per day. A random sample of 64 days is chosen from this population. What is the probability that the average number of customers that visited a particular store in a sample of 64 days is more than 169?

If you could also show how to plug into a TI-84 Plus that would be great!

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