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December 13th, 2017, 07:45 AM  #1 
Member Joined: Nov 2016 From: Ireland Posts: 72 Thanks: 2  Percentage value
Guys see this 2 1/2 %. Does anyone know where it's coming from? 
December 13th, 2017, 02:19 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,414 Thanks: 556 
The distribution of plug diameters is approximately normal which means 95% will be within 2 standard deviations of the mean. The tails total 5%, split up equally between diameters which are too large and those which are too small (2.5% each).


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