Preventing errors

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 ?

Please, any help ?

Please, anyone kind enough to help out ?

Can someone please help me with this !!

Many people are reluctant to download files from an unknown source - it
is better to try to describe your problem with example data in plain
text on the newsgroups, so that is probably why you have had no
responses.

However, in your example I would suggest you enter this formula in H6:

=i6/5

format as percentage and copy down. If you really want this column to
look blank, then format the foreground colour to white. Then in J6
enter this formula:

=AVERAGE(IF(E6:H6<>0,E6:H6))

Do not press <ENTER> when you have typed this is - instead press
<CTRL><SHIFT><ENTER> at the same time, as this is an array formula. If
you do it correctly then Excel will wrap curly braces { } around the
formula - you should not type these yourself. You can then copy this
formula down the column.

Hope this helps.

Pete

If 0% is a valid entry for column E and G (i.e. you want to include
this in your average) then you will need to make the following
amedments:

H6: =IF(i6="","",i6/5)

and copy down.

J6: =AVERAGE(IF(ISNUMBER(E6:H6),E6:H6))

commit this with <CTRL><SHIFT><ENTER> as before, then copy down. The
average will now be taken of any numeric values in the range.

Hope this helps.

Pete