Find the Mean 13 , 18 , 13 , 14 , 13 , 16 , 14 , 21 , 13

$13$ , $18$ , $13$ , $14$ , $13$ , $16$ , $14$ , $21$ , $13$

Step 1

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

$\frac{13 + 18 + 13 + 14 + 13 + 16 + 14 + 21 + 13}{9}$

Step 2

Simplify the numerator.

Add $13$ and $18$ .

$\frac{31 + 13 + 14 + 13 + 16 + 14 + 21 + 13}{9}$

Add $31$ and $13$ .

$\frac{44 + 14 + 13 + 16 + 14 + 21 + 13}{9}$

Add $44$ and $14$ .

$\frac{58 + 13 + 16 + 14 + 21 + 13}{9}$

Add $58$ and $13$ .

$\frac{71 + 16 + 14 + 21 + 13}{9}$

Add $71$ and $16$ .

$\frac{87 + 14 + 21 + 13}{9}$

Add $87$ and $14$ .

$\frac{101 + 21 + 13}{9}$

Add $101$ and $21$ .

$\frac{122 + 13}{9}$

Add $122$ and $13$ .

$\frac{135}{9}$

Step 3

Divide $135$ by $9$ .

$15$