Posted on by Judy

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? Complete using Excel and show functions used.

https://d2vlcm61l7u1fs.cloudfront.net/media%2Fe42%2Fe42b5ab2-1986-4982-8048-82668c33f9d0%2FphpPSYGBb.png
So, company is delivering at 3.5 sigma quality
b) For six sigma quality, z = 6
Z = 6-1.5 = 4.5
https://d2vlcm61l7u1fs.cloudfront.net/media%2F6f7%2F6f71e4f4-2215-40a2-8593-498be58dd20c%2FphpwXIfwf.png
https://d2vlcm61l7u1fs.cloudfront.net/media%2F6f7%2F6f71e4f4-2215-40a2-8593-498be58dd20c%2FphpwXIfwf.png
So, standard deviation should be 4.44 minutes
 
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