-3 x -3
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They are negative
Quadrants 2 and 3 have negative X values.
Add the absolute values of the two numbers, then put on a negative sign. For example: -7-3=-(7+3)=-10
You get a number that is "more negative" ie a number whose sign is negative but whose absolute value (or measure) is the sum of the absolute values of the two numbers (ie the values without the negative signs). eg -2 -(+3) = -(2+3) = -5
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