Preventing errors

[koit]

Hi all

I have a s/sheet in the middle of being set up.

I need to create a formula based on columns E, G & I. I need Column K to average the percentage of those previous 3 columns.

Column I will be presented in a number format (1-5) these are converted to percentages (see field K18 for an example of what each number is converted to)

The problem I'm facing is this.........I want the formula to be pretty robust so that if for any reason, columns E, G or I (or any combination of the 3) are not completed, the average percentage in column K is still calculated.

For example, if I populate column E18 with 100%, G18 leave blank and I18 insert a 3, column K appears as 100%. This is clearly incorrect as the average of 100% and 50% (where 3 = 50%) should be 75% !!!

Any help please ?