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.

$76.4$