Excel averageifs with or function

Question

I am using the averageifs function, and have one column where I need to calculate the average if either of the criteria are true.

I have tried using the OR function,

Answer 1

Chancea has given some good techniques I will list one more that avoids array formulas as many will find it easier to read avoiding the sumproduct.

=(SUMIF(I1:I612,"FL",N1:N612)+SUMIF(I1:I612,"IF",N1:N612))/(COUNTIF(I1:I612,"FL")+COUNTIF(I1:I612,"IF"))