What is STDEV?
Calculates standard deviation for a sample. Measures how spread out values are from the average.
Syntax
=STDEV(number1, [number2], ...)
Example
Formula: =STDEV(B1:B50)
Result: Sample standard deviation
How It Works
Measures data variability. Higher values mean more spread. Use STDEV.S for samples, STDEV.P for entire populations.