Basic Math Examples

13

$13$ ,

15

$15$ ,

15

$15$ ,

16

$16$ ,

19

$19$ ,

17

$17$ ,

15

$15$ ,

16

$16$ ,

14

$14$

Step 1

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

\frac{13 + 15 + 15 + 16 + 19 + 17 + 15 + 16 + 14}{9}

$\frac{13 + 15 + 15 + 16 + 19 + 17 + 15 + 16 + 14}{9}$

Step 2

Simplify the numerator.

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Step 2.1

Add

13

$13$ and

15

$15$ .

\frac{28 + 15 + 16 + 19 + 17 + 15 + 16 + 14}{9}

$\frac{28 + 15 + 16 + 19 + 17 + 15 + 16 + 14}{9}$

Step 2.2

Add

28

$28$ and

15

$15$ .

\frac{43 + 16 + 19 + 17 + 15 + 16 + 14}{9}

$\frac{43 + 16 + 19 + 17 + 15 + 16 + 14}{9}$

Step 2.3

Add

43

$43$ and

16

$16$ .

\frac{59 + 19 + 17 + 15 + 16 + 14}{9}

$\frac{59 + 19 + 17 + 15 + 16 + 14}{9}$

Step 2.4

Add

59

$59$ and

19

$19$ .

\frac{78 + 17 + 15 + 16 + 14}{9}

$\frac{78 + 17 + 15 + 16 + 14}{9}$

Step 2.5

Add

78

$78$ and

17

$17$ .

\frac{95 + 15 + 16 + 14}{9}

$\frac{95 + 15 + 16 + 14}{9}$

Step 2.6

Add

95

$95$ and

15

$15$ .

\frac{110 + 16 + 14}{9}

$\frac{110 + 16 + 14}{9}$

Step 2.7

Add

110

$110$ and

16

$16$ .

\frac{126 + 14}{9}

$\frac{126 + 14}{9}$

Step 2.8

Add

126

$126$ and

14

$14$ .

\frac{140}{9}

$\frac{140}{9}$

\frac{140}{9}

$\frac{140}{9}$

Step 3

Divide.

15. ¯ 5

$15.\overline{5}$

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.

15.6

$15.6$