Hi,

1. Difficult to guess why

2. "1E100" - This is a very large number I.e. 1 raised to the power of 100.
So in effect we are saying that sum all numbers which are less than or equal
to 1E100. Since an error is not a number it is ignored. You may also
specify the criteria as "<=largest numbers I your range"

3. Average(IF( - b'coz there is no averageif() function. If you do not
wish to use the array formula, you can use the SUM function in the numerator
and count function in the denominator
=SUMIF(A1:A10,"<1E100")/countif(A1:A10,"<1E100)

4. Question not clear

--
Regards,

Ashish Mathur
Microsoft Excel MVP
www.ashishmathur.com

"PaulinaDi" wrote in message
...
Thanks Sheeloo and T. Valko but I still have questions about this issue.
I'm
just copying my new questions on this new post to make it easier or you
may
refer to my first post where I wrote them originally.

The original issue is after these questions.

I use Excel 2000 so I don´t have the FilePage SetupSheet tab
Under Print...Cell errors asselect blank OK option available.

The =SUMIF(A1:A10,"<1E100") formula helped me but would like to know what
does "<1E100" means.

About the AVERAGE formula =AVERAGE(IF(ISNUMBER(A1:A10),A1:A10))
I would like to know why should I use an array formula (in fact it worked
but just to know why)

And about the =IF(ISNA(your_formula),"",your_formula) formula, maybe I get
a
blank cell to SUM or to AVERAGE but I get a mark on my chart just on that
month I'm using it and if I substitute the "" for NA() I get the #N/A mark
on
my printed files.

____________________________________________

I'm using a formula to bring results from another worksheet but in some
cases
I get the #N/A result as I don´t have data on the original worksheet. To
get
the graphics on the final worksheet I use the formula with NA() not to
give
me 0 values on the chart and I also use the conditional formula to get the
#N/A results just like the cells were empty (the same color I use for that
cell) but when I print my page, I get the #N/A in black (so I can see
them)
and additional I'm not able to get a SUM or AVERAGE on each column as I
get
the #N/A for those cells with that mark.

Two examples of the formula I'm using a

=IF(SUMPRODUCT(--('2009'!$B$8:$B$256=$O14),--('2009'!$B$8:$B$256<$O15))=0,NA(),SUMPRODUCT(--('2009'!$B$8:$B$256=$O14),--('2009'!$B$8:$B$256<$O15),('2009'!E$8:E$256))/SUMPRODUCT(--('2009'!$B$8:$B$256=$O14),--('2009'!$B$8:$B$256<$O15)))

=IF(L9/L8-1=0,NA(),L9/L8-1)

How may I get the SUM or the AVERAGE for that column and how may I print
my
file without seeing the #N/A's in black?