Basic Math Examples

$3$ , $8$ , $8$ , $6$ , $2$ , $9$ , $8$ , $7$ , $9$ , $6$ , $9$ , $3$ , $1$ , $6$ , $2$ , $9$ , $8$ , $7$ , $7$ , $9$

Step 1

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

$\frac{3 + 8 + 8 + 6 + 2 + 9 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2

Simplify the numerator.

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Step 2.1

Add $3$ and $8$ .

$\frac{11 + 8 + 6 + 2 + 9 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.2

Add $11$ and $8$ .

$\frac{19 + 6 + 2 + 9 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.3

Add $19$ and $6$ .

$\frac{25 + 2 + 9 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.4

Add $25$ and $2$ .

$\frac{27 + 9 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.5

Add $27$ and $9$ .

$\frac{36 + 8 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.6

Add $36$ and $8$ .

$\frac{44 + 7 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.7

Add $44$ and $7$ .

$\frac{51 + 9 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.8

Add $51$ and $9$ .

$\frac{60 + 6 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.9

Add $60$ and $6$ .

$\frac{66 + 9 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.10

Add $66$ and $9$ .

$\frac{75 + 3 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.11

Add $75$ and $3$ .

$\frac{78 + 1 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.12

Add $78$ and $1$ .

$\frac{79 + 6 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.13

Add $79$ and $6$ .

$\frac{85 + 2 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.14

Add $85$ and $2$ .

$\frac{87 + 9 + 8 + 7 + 7 + 9}{20}$

Step 2.15

Add $87$ and $9$ .

$\frac{96 + 8 + 7 + 7 + 9}{20}$

Step 2.16

Add $96$ and $8$ .

$\frac{104 + 7 + 7 + 9}{20}$

Step 2.17

Add $104$ and $7$ .

$\frac{111 + 7 + 9}{20}$

Step 2.18

Add $111$ and $7$ .

$\frac{118 + 9}{20}$

Step 2.19

Add $118$ and $9$ .

$\frac{127}{20}$

Step 3

Divide.

$6.35$

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.

$6.4$