Calculates standard deviation based on the entire population given as arguments. The standard deviation is a measure of how widely values are dispersed from the average value (the mean).
Syntax
STDEVP(number1,number2,...)
Number1,number2,... are 1 to 30 number arguments corresponding to a population.
Remarks

Logical values such as TRUE and FALSE and text are ignored. If logical values and text must not be ignored, use the STDEVPA spreadsheet function.

STDEVP assumes that its arguments are the entire population. If your data represents a sample of the population, then compute the standard deviation using STDEV.

For large sample sizes, STDEV and STDEVP return approximately equal values.

The standard deviation is calculated using the "biased" or "n" method.

STDEVP uses the following formula:
Example
St1 
St2 
St3 
St4 
St5 
St6 
St7 
St8 
St9 
St10 
Formula 
Description (Result) 
1345 
1301 
1368 
1322 
1310 
1370 
1318 
1350 
1303 
1299 
=STDEVP([St1], [St2], [St3], [St4], [St5], [St6], [St7], [St8], [St9], [St10]) 
Standard deviation of breaking strength, assuming only 10 tools are produced (26.05455814) 