How to find the second standard deviation?

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Guest

Does anyone have any suggestions on how to find the second standard deviation?
For the first S.D., which is STDEV(a1:a20).
Does anyone have any suggestions?
Thanks in advance for any suggestions?
Eric
 
The standard deviation measures variation about the mean. Two standard
deviations is just twice the standard deviation:

=2*STDEV(A1:A10)
 
I suspect you may mean 2 standard deviations which is simply standard
deviation * 2. In a normal distribution 95.45% of the data points would be
within 2 standard deviations

Mike
 
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