Prepare 3 sigma control chart

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a) A bus company is concerned about its record of on-time performance. The Toronto bus station experiences 75 bus arrivals operations each day of the week, with the record of on-time arrivals for the previous 10 days: 68, 72, 70, 67, 73, 73, 69, 71, 68 and 72. Prepare 3 sigma control chart(s) for on time arrivals. Today 67, buses arrived on time. Is this within acceptable limits?

Reference no: EM132320736

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