3 Sigma is 66800 defects per million pieces
6 Sigma is 3-4 defects per million pieces
You can check out the number of defective pieces per million & the % accuracy for all Sigma levels in the six sigma conversion chart in the related links section
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sigma represents standard deviation. In a normal distribution, +/- 1 sigma from the mean, for instance, corresponds to approximately 67% of the area under the normal distribution. +/- 2 sigma corrresponds to 95% of the area and +/- 3 sigma from the mean corresponds to 99% of the area under a normal distribution. The area that is covered under +/- six sigma from the mean corresponds to nearly 100% -- that is, the part of the area NOT under that +/- 6 sigma is in the 10^-15 range or 1/1,000,000,000,000,000. The six sigma name borrows from this to suggest that the method gives this degree of certainty: that in 999,999,999,999,999 in 1,000,000,000,000,000 cases the result will be predictable. It does nothing, however, to explain how an agricultural process management methodology applies to other fields.
Nothing Major. Other than six axis and the fact it is wireless.
It is 5.8 minus 3 = 2.8
Zero. In general, the difference between any number and itself is zero.
The difference is two thirds (2/3) To answer these questions, one needs to turn mixed fractions, such as eight and two thirds, into (im)proper fractions, such as twenty six thirds. The question then becomes what is the difference between 26 thirds and 28 thirds. The answer: 28/3-26/3 = (28-26)/3 = 2/3