Basic Math Examples

- 80

$- 80$ ,

20

$20$ ,

- 5

$- 5$ ,

1.25

$1.25$

Step 1

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

\frac{- 80 + 20 - 5 + 1.25}{4}

$\frac{- 80 + 20 - 5 + 1.25}{4}$

Step 2

Simplify the numerator.

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Step 2.1

Add

- 80

$- 80$ and

20

$20$ .

\frac{- 60 - 5 + 1.25}{4}

$\frac{- 60 - 5 + 1.25}{4}$

Step 2.2

Subtract

5

$5$ from

- 60

$- 60$ .

\frac{- 65 + 1.25}{4}

$\frac{- 65 + 1.25}{4}$

Step 2.3

Add

- 65

$- 65$ and

1.25

$1.25$ .

\frac{- 63.75}{4}

$\frac{- 63.75}{4}$

\frac{- 63.75}{4}

$\frac{- 63.75}{4}$

Step 3

Divide

- 63.75

$- 63.75$ by

4

$4$ .

- 15.9375

$- 15.9375$

Step 4

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.

- 15.9

$- 15.9$