Average number between dates

[Richard]

I have a column of dates in Sheet1 Column A. In Sheet 2 Columns A thru J, I
have a list of random numbers. Is there a way to average each number that
comes up. For example: Sheet1 has a date of 8/1/09 with a "1" on
Sheet2.(=COUNTIF(Sheet1!B:F,"1") This gets me the number of "1"s Then the "1"
does not show up again untill 8/5/09, then again on 8/6/09. A total of 3
"1"'s. I need a formula that shows the average time from the first "1" to the
last "1". Thanks in advance!!!

 

[T. Valko]

Is it possible for a number to appear on a date more than once?

For example:

8/1/2009.....1.....5.....1.....3

1 appears twice on the same day.

 

[Richard]

No. There is never the same number on the same day. Thanks so much for your
help!!

 

[T. Valko]

See if this does what you want...

A1:A20 = dates
B1:E20 = random numbers

H1 = lookup number = 1
H2 = formula = count

=COUNTIF(B1:E20,H1)

H3 = formula to get the average number of days

Array entered** :

=IF(H2<2,H2,MAX(1,(MAX(IF(B1:E20=H1,A1:A20))-MIN(IF(B1:E20=H1,A1:A20)))/H2))

** array formulas need to be entered using the key combination of
CTRL,SHIFT,ENTER (not just ENTER). Hold down both the CTRL key and the SHIFT
key then hit ENTER.