Basic Math Examples

$1$ , $2$ , $1$ , $2$ , $1$ , $3$ , $3$ , $4$ , $3$

Step 1

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

$\frac{1 + 2 + 1 + 2 + 1 + 3 + 3 + 4 + 3}{9}$

Step 2

Simplify the numerator.

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Step 2.1

Add $1$ and $2$ .

$\frac{3 + 1 + 2 + 1 + 3 + 3 + 4 + 3}{9}$

Step 2.2

Add $3$ and $1$ .

$\frac{4 + 2 + 1 + 3 + 3 + 4 + 3}{9}$

Step 2.3

Add $4$ and $2$ .

$\frac{6 + 1 + 3 + 3 + 4 + 3}{9}$

Step 2.4

Add $6$ and $1$ .

$\frac{7 + 3 + 3 + 4 + 3}{9}$

Step 2.5

Add $7$ and $3$ .

$\frac{10 + 3 + 4 + 3}{9}$

Step 2.6

Add $10$ and $3$ .

$\frac{13 + 4 + 3}{9}$

Step 2.7

Add $13$ and $4$ .

$\frac{17 + 3}{9}$

Step 2.8

Add $17$ and $3$ .

$\frac{20}{9}$

Step 3

Divide.

$2.\overline{2}$

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.

$2.2$