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Report Abuse. For length the average is 5.88 inches and the median is 5.65 inches. For girth the average is 4.97 inches and the median is 4.67 inches. The average is larger because very long and very thick ones bias things a bit. Source(s): http://www.mraverage.com/stats.htm. Jordan Â· 7 years ago.
The subgroup sample size used here is 3, but it can range from 2 to about 10â12 and is typically around 5. SHARE ON: The following is an example of how the control limits are computed for an x-bar and R chart. Note that at least 25 sample subgroups should used to get an accurate measure of the process variation. The subgroup sample size used here is 3, but it can range from 2 to about 10â12 and is typically around 5. Note: D3, D4, and A2 were all obtained from the Control Chart Constants Table for a sample size of n = 3.