Time Summary using percentile P=90

I am trying to determine the 90 percentile for time summary, it appears using the selection for Percentile that the summary seems to be higher than expected, I want to be sure that i am using this correctly. I first calculated the time difference shown below, then summarized it using the 90th percentile in the summary selection. Any help would be appreciated. Thanks

({@Enroute Time}-{@Dispatch Time})*1440


Screen Shot of 90 Percentile Summary
Screenshot of summary selection
srodgers45Asked:
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mlmccCommented:
When I add the counts i get 3960 not 4024.  Where are the missing 84?

It seems you are doing it correctly.

mlmcc
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srodgers45Author Commented:
The time summary counts have some items excluded based on criteria, the overall do not. i have a disclaimer in the report explaining this. thanks for the help.
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