Formulas Needed - MIN, AVERAGE, MAX

[WFP111]

This seems like a simple task, but I cannot get any formulas to provide the appropriate results.

I need formulas for MIN, AVERAGE, MAX.
Need to ignore zero-values
Need to ignore columns in between the subject-columns of "Cost".

Array formulas do not appear to work, because there is other unrelated column data between the "Cost" columns that need to be calculated.

See attached spreadsheet.