Fri, 13 Jul 2007 22:21:24 -0300 from Bernard Liengme
:

wrote in message
oups.com...
I have a list of numbers in A1:A20 that has a STDEV of 27.6. I need a
formula that I can copy down that will tell me how many STDEV's above
and below each number is. Thanks in advance PJ.

Assuming by "how many STDEV's above and below each number is", you mean how
many STDEV above/below the average, use
=(A1-AVERAGE($A$1:$A$20))/STDEV($A$1:$A$20)

Or use the STANDARDIZE function:

=standardize(A1, average(A$1:A$20), stdev(A$1:A$20))

Like Bernard, I would not hard-code the 27.6 because if any of the
numbers in column A change you'd have to remember to recompute the
standard deviation. This way it's autmatic.

--
Stan Brown, Oak Road Systems, Tompkins County, New York, USA
http://OakRoadSystems.com/