You are the manager of a chain specialty clothing store and receive a call from your regional manager wanting to know what would be the expected sales per customer for the next Saturday. You decide to select 36 sales receipts randomly from the last Saturday's sales records. Your records indicated that on the average customers were spending about $80 per sales ticket. Your records, to date, revealed that there was a $3 standard deviation on all the Saturday clothing sales. You want to be 90% certain that the information that you provide to the regional manager is the correct answer.
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