# Find the Variance 9 , 10 , 10 , 8 , 7 , 11 , 12 , 9

, , , , , , ,
The mean of a set of numbers is the sum divided by the number of terms.
Simplify the numerator.
Cancel the common factor of and .
Factor out of .
Cancel the common factors.
Factor out of .
Cancel the common factor.
Rewrite the expression.
Divide.
Set up the formula for variance. The variance of a set of values is a measure of the spread of its values.
Set up the formula for variance for this set of numbers.
Simplify the result.
Simplify the numerator.
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 .
Raise to the power of .
Subtract from .
Raise to the power of .
Subtract from .
Raise to the power of .
Reduce the expression by cancelling the common factors.
Subtract from .
Cancel the common factor of and .
Rewrite as .
Cancel the common factors.
Rewrite as .
Cancel the common factor.
Rewrite the expression.
Approximate the result.
Find the Variance 9 , 10 , 10 , 8 , 7 , 11 , 12 , 9