The mean of a set of numbers is the sum divided by the number of terms.

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Divide by .

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 numerator.

Subtract from .

Raise to the power of .

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Raise to the power of .

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Raise to the power of .

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Simplify the expression.

Subtract from .

Divide by .

Approximate the result.

Find the Variance 127 135 128 131 133 127 122