If I may be permitted......
The "rng" in Harlan's formula is simply "range", i.e. in your case
H2:H132
Following Harlan's argument I assume you have only positive values and
zeroes and you can therefore use
=AVERAGE(IF(H2:H132>0,H2:H132))
This formula needs to be confirmed with CTRL+SHIFT+ENTER (as Biff says)
so that curly braces appear around the formula in the formula bar,
alternatively you can use a formula which just requires ENTER
=SUM(H2:H132)/MAX(1,COUNTIF(H2:H132,">0"))