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Standard Deviation
The
standard deviation
, which serves as a measure of the spread of values
X
_{1}
,
X
_{2}
, ...,
X
_{N}
is defined as:
Note
: The the lowercase Greek letter sigma σ is used to represent the standard deviation of a population while the letter
s
is used to denote the standard deviation of a sample taken from that population.
Example
:
Find the standard deviation
s
for the numbers 3, 12, 9, 4, and 2.
Solution
:
Related Topics
:
Variance