Pre-Algebra Examples

$3$ , $12$ , $16$ , $4$ , $2$ , $7$ , $20$

Step 1

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

$\frac{3 + 12 + 16 + 4 + 2 + 7 + 20}{7}$

Step 2

Simplify the numerator.

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Step 2.1

Add $3$ and $12$ .

$\frac{15 + 16 + 4 + 2 + 7 + 20}{7}$

Step 2.2

Add $15$ and $16$ .

$\frac{31 + 4 + 2 + 7 + 20}{7}$

Step 2.3

Add $31$ and $4$ .

$\frac{35 + 2 + 7 + 20}{7}$

Step 2.4

Add $35$ and $2$ .

$\frac{37 + 7 + 20}{7}$

Step 2.5

Add $37$ and $7$ .

$\frac{44 + 20}{7}$

Step 2.6

Add $44$ and $20$ .

$\frac{64}{7}$

Step 3

Divide.

$9.\overline{142857}$

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.

$9.1$