Find the Mean -10 , 5 , -3 , -15 , 10 , -2 , 12

$- 10$ ,

$5$ ,

$- 3$ ,

$- 15$ ,

$10$ ,

$- 2$ ,

$12$

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.

Add

$- 10$ and

$5$ .

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

Subtract

$3$ from

$- 5$ .

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

Subtract

$15$ from

$- 8$ .

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

Add

$- 23$ and

$10$ .

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

Subtract

$2$ from

$- 13$ .

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

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.

$- 0.4$

Find the Mean -10 , 5 , -3 , -15 , 10 , -2 , 12

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