# Find the Standard Deviation 400 , 0 , 0÷490 , 0 , 0 , , , ,
Find the mean.
Divide by .
The mean of a set of numbers is the sum divided by the number of terms.
Cancel the common factor of and .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Factor out of .
Cancel the common factors.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Divide by .
Simplify by adding zeros.
Simplify each value in the list.
Convert to a decimal value.
Convert to a decimal value.
The simplified values are .
Set up the formula for sample standard deviation. The standard deviation of a set of values is a measure of the spread of its values.
Set up the formula for standard deviation for this set of numbers.
Simplify the result.
Subtract from .
Raise to the power of .
Subtract from .
Raise to the power of .
Subtract from .
Raise to the power of .
Subtract from .
Raise to the power of .
Subtract from .
Raise to the power of .
Subtract from .
Divide by .
Rewrite as .
Factor out of .
Rewrite as .
Pull terms out from under the radical.
The standard deviation should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.
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