Based on your original question, "Is it possible to remove the highest and lowest value when you are averaging a group of cells in a row", I came up with:
(SUM(A17:I17)- (MAX(A17:I17)) - (MIN(A17:I17))) / 7
This assumes that:
1. The number of cells in the calculation will remain constant (7).
2. The maximum and minimum values will be "removed" only once regardless of how many cells contain that value.