Basic Math Examples

8.7

$8.7$ ,

8.8

$8.8$ ,

8.9

$8.9$ ,

9.4

$9.4$ ,

10.2

$10.2$ ,

9.8

$9.8$ ,

9

$9$ ,

8.1

$8.1$ ,

9.5

$9.5$

Step 1

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

\frac{8.7 + 8.8 + 8.9 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}

$\frac{8.7 + 8.8 + 8.9 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}$

Step 2

Simplify the numerator.

Tap for more steps...

Step 2.1

Add

8.7

$8.7$ and

8.8

$8.8$ .

\frac{17.5 + 8.9 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}

$\frac{17.5 + 8.9 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}$

Step 2.2

Add

17.5

$17.5$ and

8.9

$8.9$ .

\frac{26.4 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}

$\frac{26.4 + 9.4 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}$

Step 2.3

Add

26.4

$26.4$ and

9.4

$9.4$ .

\frac{35.8 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}

$\frac{35.8 + 10.2 + 9.8 + 9 + 8.1 + 9.5}{9}$

Step 2.4

Add

35.8

$35.8$ and

10.2

$10.2$ .

\frac{46 + 9.8 + 9 + 8.1 + 9.5}{9}

$\frac{46 + 9.8 + 9 + 8.1 + 9.5}{9}$

Step 2.5

Add

46

$46$ and

9.8

$9.8$ .

\frac{55.8 + 9 + 8.1 + 9.5}{9}

$\frac{55.8 + 9 + 8.1 + 9.5}{9}$

Step 2.6

Add

55.8

$55.8$ and

9

$9$ .

\frac{64.8 + 8.1 + 9.5}{9}

$\frac{64.8 + 8.1 + 9.5}{9}$

Step 2.7

Add

64.8

$64.8$ and

8.1

$8.1$ .

\frac{72.9 + 9.5}{9}

$\frac{72.9 + 9.5}{9}$

Step 2.8

Add

72.9

$72.9$ and

9.5

$9.5$ .

\frac{82.4}{9}

$\frac{82.4}{9}$

\frac{82.4}{9}

$\frac{82.4}{9}$

Step 3

Divide

82.4

$82.4$ by

9

$9$ .

9.1 ¯ 5

$9.1\overline{5}$

Step 4

Divide.

9.1 ¯ 5

$9.1\overline{5}$

Step 5

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.

9.16

$9.16$