3 PPM DEFECTS MEAN 999997 good parts in a million. If a normal distribution
curve means 1 miilion then as a decimal this is 0.999 997. Looking up my
normal distribution tables for this I get 4.53 sigma, not six sigma.
According to my maths tables 6 sigma is 1 failure in 1000 million. Now I
know that Motorolla have altered the rules a little, but I don't quite
understand how, (like including touch up / rework as normal manufacturing
processes). Can anyone explain this little deviation from the maths tables?
Regards
Edward Brunker

-----Original Message-----
From: Hollandsworth, Ron [mailto:[log in to unmask]]
Sent: Tuesday, February 08, 2000 1:41 PM
To: [log in to unmask]
Subject: [TN] Subj: Six Sigma


Good Morning TechNetters!
Here is a brain teaser for this early morning.  Thinking six sigma.  Six
sigma is suppose to be 3.4 PPM.  Good!  Now what is five sigma, four, three,
two , one.  There is a chart that shows that relationship of a certain sigma
and the PPM associated with that particular sigma value.

Ok, the first five to get the right answer will be eligible to go on to the
"Who wants to be a Black Belt" show.  Enough levity, can someone help me
out.  Do you know the chart I am referring to?  Can you send me the values
and I'll make a chart.

Grasshopper Ron

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