Basic Math Examples

$88$ , $89$ , $65$ , $62$ , $83$ , $63$ , $84$ , $63$ , $74$ , $64$ , $71$ , $82$ , $66$ , $88$ , $79$ , $60$ , $86$ , $93$ , $99$ , $60$ , $85$

Step 1

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

$\frac{88 + 89 + 65 + 62 + 83 + 63 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2

Simplify the numerator.

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Step 2.1

Add $88$ and $89$ .

$\frac{177 + 65 + 62 + 83 + 63 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.2

Add $177$ and $65$ .

$\frac{242 + 62 + 83 + 63 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.3

Add $242$ and $62$ .

$\frac{304 + 83 + 63 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.4

Add $304$ and $83$ .

$\frac{387 + 63 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.5

Add $387$ and $63$ .

$\frac{450 + 84 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.6

Add $450$ and $84$ .

$\frac{534 + 63 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.7

Add $534$ and $63$ .

$\frac{597 + 74 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.8

Add $597$ and $74$ .

$\frac{671 + 64 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.9

Add $671$ and $64$ .

$\frac{735 + 71 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.10

Add $735$ and $71$ .

$\frac{806 + 82 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.11

Add $806$ and $82$ .

$\frac{888 + 66 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.12

Add $888$ and $66$ .

$\frac{954 + 88 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.13

Add $954$ and $88$ .

$\frac{1042 + 79 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.14

Add $1042$ and $79$ .

$\frac{1121 + 60 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.15

Add $1121$ and $60$ .

$\frac{1181 + 86 + 93 + 99 + 60 + 85}{21}$

Step 2.16

Add $1181$ and $86$ .

$\frac{1267 + 93 + 99 + 60 + 85}{21}$

Step 2.17

Add $1267$ and $93$ .

$\frac{1360 + 99 + 60 + 85}{21}$

Step 2.18

Add $1360$ and $99$ .

$\frac{1459 + 60 + 85}{21}$

Step 2.19

Add $1459$ and $60$ .

$\frac{1519 + 85}{21}$

Step 2.20

Add $1519$ and $85$ .

$\frac{1604}{21}$

Step 3

Divide.

$76.38095238$

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.

$76.4$