A pizza delivery company promises to deliver all customer or

A pizza delivery company promises to deliver all customer orders within one hour of receiving an order at one of its stores. Actual data for all pizza delivered during the past week showed that the average delivery time was 40 minutes and the standard deviation was 10 minutes. (a) Is the company delivering Six Sigma quality to its customers? (b) If not, then how much should the standard deviation of the process be reduced to get Six Sigma quality?

Solution

a. no, they are not following the six sigma quality time for serving their customers.

b. if they want to serve their customers with six sigma quality, they need to serve customers with zero standard deviation of time.