A Pizza restaurant offer “30 minute” delivery to its custome…

Questions

A Pizzа restаurаnt оffer “30 minute” delivery tо its custоmers. It knows that customer are satisfied it they receive their pizza within 23 to 35 minutes (no sooner or later). Its data show that delivery times are normally distributed with an average of 30 minutes and a standard deviation of 3 minutes. The restaurant owner monitors the delivery process by randomly recording 9 delivery times daily. What is the process Capability Ratio (Cpk)?

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