Basic Math Examples

$21$ , $25$ , $26$ , $29$ , $31$ , $33$ , $33$ , $34$ , $34$ , $38$ , $39$ , $41$ , $42$ , $45$ , $49$ , $61$ , $72$ , $80$

Step 1

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

$\frac{21 + 25 + 26 + 29 + 31 + 33 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2

Simplify the numerator.

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Step 2.1

Add $21$ and $25$ .

$\frac{46 + 26 + 29 + 31 + 33 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.2

Add $46$ and $26$ .

$\frac{72 + 29 + 31 + 33 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.3

Add $72$ and $29$ .

$\frac{101 + 31 + 33 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.4

Add $101$ and $31$ .

$\frac{132 + 33 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.5

Add $132$ and $33$ .

$\frac{165 + 33 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.6

Add $165$ and $33$ .

$\frac{198 + 34 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.7

Add $198$ and $34$ .

$\frac{232 + 34 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.8

Add $232$ and $34$ .

$\frac{266 + 38 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.9

Add $266$ and $38$ .

$\frac{304 + 39 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.10

Add $304$ and $39$ .

$\frac{343 + 41 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.11

Add $343$ and $41$ .

$\frac{384 + 42 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.12

Add $384$ and $42$ .

$\frac{426 + 45 + 49 + 61 + 72 + 80}{18}$

Step 2.13

Add $426$ and $45$ .

$\frac{471 + 49 + 61 + 72 + 80}{18}$

Step 2.14

Add $471$ and $49$ .

$\frac{520 + 61 + 72 + 80}{18}$

Step 2.15

Add $520$ and $61$ .

$\frac{581 + 72 + 80}{18}$

Step 2.16

Add $581$ and $72$ .

$\frac{653 + 80}{18}$

Step 2.17

Add $653$ and $80$ .

$\frac{733}{18}$

Step 3

Divide.

$40.7\overline{2}$

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.

$40.7$