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Knights

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STDEV
Estimates standard deviation based on a sample. The standard deviation is a measure of how widely values are dispersed from the average value (the mean).
Syntax
STDEV (number1, number2,…)
Number1, number2… are 1 to 30 number arguments corresponding to a sample of a population. You can also use a single array or a reference to an array instead of arguments separated by commas.
Remarks
STDEV assume that its arguments are a sample of the population. If your data represents the entire population, then compute the standard deviation using STDEVP.
The standard deviation is calculated using the “n-1” method.
Arguments can either be numbers or names, arrays, or references that contain numbers. Logical values and text representation of numbers that you type directly into the list of arguments are counted.
If an argument is an array or reference, only numbers in that array or reference are counted. Empty cells, logical values, text, or error values in the array or reference are ignored.
Arguments that are error values or text that cannot be translated into numbers cause errors.
If you want to include logical values or text representation of numbers in a reference as a part of the calculation, use the STDEVA function.
EXAMPLE:
Suppose 10 tools stamped from the same machine during a production run are collected as a random sample and measured for breaking strength.
The example may be easier to understand if we copy it to a blank worksheet. A 1 Strength 2 1345 3 1301 4 1368 5 1322 6 1310 7 1370 8 1318 9 1350 10 1303 11 1299 Formula Description (Result)
=STDEV (A2:A11) Standard deviation of breaking strength

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