Basic Math Examples

$- 10$ , $5$ , $- 3$ , $- 15$ , $10$ , $- 2$ , $12$

Step 1

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

$\frac{- 10 + 5 - 3 - 15 + 10 - 2 + 12}{7}$

Step 2

Simplify the numerator.

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Step 2.1

Add $- 10$ and $5$ .

$\frac{- 5 - 3 - 15 + 10 - 2 + 12}{7}$

Step 2.2

Subtract $3$ from $- 5$ .

$\frac{- 8 - 15 + 10 - 2 + 12}{7}$

Step 2.3

Subtract $15$ from $- 8$ .

$\frac{- 23 + 10 - 2 + 12}{7}$

Step 2.4

Add $- 23$ and $10$ .

$\frac{- 13 - 2 + 12}{7}$

Step 2.5

Subtract $2$ from $- 13$ .

$\frac{- 15 + 12}{7}$

Step 2.6

Add $- 15$ and $12$ .

$\frac{- 3}{7}$

Step 3

Move the negative in front of the fraction.

$- \frac{3}{7}$

Step 4

Divide.

$- 0.\overline{428571}$

Step 5

The mean 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.

$- 0.4$