# Statistics Examples

, , , ,

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

Simplify the numerator.

Add and .

Add and .

Add and .

Add and .

Divide by .

Convert to a decimal value.

Convert to a decimal value.

Convert to a decimal value.

Convert to a decimal value.

Convert to a decimal value.

The simplified values are .

Set up the formula for 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 expression.

Subtract from .

Raise to the power of .

Subtract from .

Raise to the power of .

Subtract from .

Raise to the power of .

Subtract from .

Remove parentheses around .

Raise to the power of .

Subtract from .

Remove parentheses around .

Raise to the power of .

Add and .

Add and .

Add and .

Add and .

Subtract from .

Reduce the expression by cancelling the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Rewrite as .

Multiply by .

Simplify.

Combine.

Raise to the power of .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Rewrite as .

Combine using the product rule for radicals.

Multiply by .

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.