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From: Meebers on 15 Apr 2010 15:41
I have a long list (1400) of patient check in's and registration
completion by time formated as 13:30. I am trying to find the standard
deviation and graph a "bell curve" from the average time of the process
which is 12 minutes. Not sure on how to process the information for stdev
data and finding a chart which I can display data as + or - about the
center without the - portion going below the horizontal line. I know the
volume peaks between 8-9 am. Tx for any ideas.

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