Basic Math Examples

$8.5$ , $7.5$ , $7$ , $6$ , $8.5$ , $9.5$ , $10$ , $13$ , $10$ , $11.5$ , $10$ , $12$

Step 1

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

$\frac{8.5 + 7.5 + 7 + 6 + 8.5 + 9.5 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2

Simplify the numerator.

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Step 2.1

Add $8.5$ and $7.5$ .

$\frac{16 + 7 + 6 + 8.5 + 9.5 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.2

Add $16$ and $7$ .

$\frac{23 + 6 + 8.5 + 9.5 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.3

Add $23$ and $6$ .

$\frac{29 + 8.5 + 9.5 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.4

Add $29$ and $8.5$ .

$\frac{37.5 + 9.5 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.5

Add $37.5$ and $9.5$ .

$\frac{47 + 10 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.6

Add $47$ and $10$ .

$\frac{57 + 13 + 10 + 11.5 + 10 + 12}{12}$

Step 2.7

Add $57$ and $13$ .

$\frac{70 + 10 + 11.5 + 10 + 12}{12}$

Step 2.8

Add $70$ and $10$ .

$\frac{80 + 11.5 + 10 + 12}{12}$

Step 2.9

Add $80$ and $11.5$ .

$\frac{91.5 + 10 + 12}{12}$

Step 2.10

Add $91.5$ and $10$ .

$\frac{101.5 + 12}{12}$

Step 2.11

Add $101.5$ and $12$ .

$\frac{113.5}{12}$

Step 3

Divide $113.5$ by $12$ .

$9.458\overline{3}$

Step 4

Divide.

$9.458\overline{3}$

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.

$9.5$