Basic Math Examples

$- 12$ , $- 7$ , $- 2$ , $3$

Step 1

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

$\frac{- 12 - 7 - 2 + 3}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Subtract $7$ from $- 12$ .

$\frac{- 19 - 2 + 3}{4}$

Step 2.2

Subtract $2$ from $- 19$ .

$\frac{- 21 + 3}{4}$

Step 2.3

Add $- 21$ and $3$ .

$\frac{- 18}{4}$

Step 3

Reduce the expression by cancelling the common factors.

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Step 3.1

Cancel the common factor of $- 18$ and $4$ .

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Step 3.1.1

Factor $2$ out of $- 18$ .

$\frac{2 (- 9)}{4}$

Step 3.1.2

Cancel the common factors.

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Step 3.1.2.1

Factor $2$ out of $4$ .

$\frac{2 \cdot - 9}{2 \cdot 2}$

Step 3.1.2.2

Cancel the common factor.

$\frac{2 \cdot - 9}{2 \cdot 2}$

Step 3.1.2.3

Rewrite the expression.

$\frac{- 9}{2}$

Step 3.2

Move the negative in front of the fraction.

$- \frac{9}{2}$

Step 4

Divide.

$- 4.5$