Basic Math Examples

$- 9$ , $- 2$ , $5$ , $12$

Step 1

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

$\frac{- 9 - 2 + 5 + 12}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Subtract $2$ from $- 9$ .

$\frac{- 11 + 5 + 12}{4}$

Step 2.2

Add $- 11$ and $5$ .

$\frac{- 6 + 12}{4}$

Step 2.3

Add $- 6$ and $12$ .

$\frac{6}{4}$

Step 3

Cancel the common factor of $6$ and $4$ .

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Step 3.1

Factor $2$ out of $6$ .

$\frac{2 (3)}{4}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor $2$ out of $4$ .

$\frac{2 \cdot 3}{2 \cdot 2}$

Step 3.2.2

Cancel the common factor.

$\frac{2 \cdot 3}{2 \cdot 2}$

Step 3.2.3

Rewrite the expression.

$\frac{3}{2}$

Step 4

Divide.

$1.5$