Formula to remove smallest & largest # when doing an average calculation

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Hello,

I am currently trying to get an average of time and need to remove the outliers (i.e. -8.00 & 22.00). I currently have an average formula that includes those outliers:

=AVG([Shortest Fuel Vendor Install Time]@row, [Longest Fuel Vendor Install Time]@row)

As always, any assistance is greatly appreciated.

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