QUESTION 2 You are the manager of a auto parts 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 50 sales receipts randomly from the past four Saturday's sales records. Your records indicated that on the average customers were spending about $160 per sales ticket. Your records, to date, revealed that there was a $5 standard deviation on all the Saturday parts sales. You want to be 90% certain that the information that you provide to the regional manager is the correct answer. X =