Basic Math Examples

$25$ , $26$ , $29$ , $21$ , $23$ , $18$ , $15$ , $25$ , $29$ , $24$ , $26$ , $28$

Step 1

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

$\frac{25 + 26 + 29 + 21 + 23 + 18 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2

Simplify the numerator.

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Step 2.1

Add $25$ and $26$ .

$\frac{51 + 29 + 21 + 23 + 18 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.2

Add $51$ and $29$ .

$\frac{80 + 21 + 23 + 18 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.3

Add $80$ and $21$ .

$\frac{101 + 23 + 18 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.4

Add $101$ and $23$ .

$\frac{124 + 18 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.5

Add $124$ and $18$ .

$\frac{142 + 15 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.6

Add $142$ and $15$ .

$\frac{157 + 25 + 29 + 24 + 26 + 28}{12}$

Step 2.7

Add $157$ and $25$ .

$\frac{182 + 29 + 24 + 26 + 28}{12}$

Step 2.8

Add $182$ and $29$ .

$\frac{211 + 24 + 26 + 28}{12}$

Step 2.9

Add $211$ and $24$ .

$\frac{235 + 26 + 28}{12}$

Step 2.10

Add $235$ and $26$ .

$\frac{261 + 28}{12}$

Step 2.11

Add $261$ and $28$ .

$\frac{289}{12}$

Step 3

Divide.

$24.08\overline{3}$

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.

$24.1$