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In Statistics, Which Greek Letter Is Customarily Used In Lower-Case Form To Denote The Standard Deviation Of A Distribution, And In Upper-Case Form As A Summation Sign? In The Former Sense, ''''Six [Blank]'''' Is A Business Concept For Process Improvement, Aiming For A Failure Rate Of Less Than One In Three Hundred Thousand.'''

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1. In Statistics, Which Greek Letter Is Customarily Used In Lower-Case Form To Denote The Standard Deviation Of A Distribution, And In Upper-Case Form As A Summation Sign? In The Former Sense, ''''Six [Blank]'''' Is A Business Concept For Process Improvement, Aiming For A Failure Rate Of Less Than One In Three Hundred Thousand.'''





 
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