Basic Math Examples

$120$ , $124$ , $132$ , $145$ , $200$ , $255$ , $260$ , $292$ , $308$ , $314$ , $342$ , $407$ , $421$ , $435$ , $452$

Step 1

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

$\frac{120 + 124 + 132 + 145 + 200 + 255 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2

Simplify the numerator.

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Step 2.1

Add $120$ and $124$ .

$\frac{244 + 132 + 145 + 200 + 255 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.2

Add $244$ and $132$ .

$\frac{376 + 145 + 200 + 255 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.3

Add $376$ and $145$ .

$\frac{521 + 200 + 255 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.4

Add $521$ and $200$ .

$\frac{721 + 255 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.5

Add $721$ and $255$ .

$\frac{976 + 260 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.6

Add $976$ and $260$ .

$\frac{1236 + 292 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.7

Add $1236$ and $292$ .

$\frac{1528 + 308 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.8

Add $1528$ and $308$ .

$\frac{1836 + 314 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.9

Add $1836$ and $314$ .

$\frac{2150 + 342 + 407 + 421 + 435 + 452}{15}$

Step 2.10

Add $2150$ and $342$ .

$\frac{2492 + 407 + 421 + 435 + 452}{15}$

Step 2.11

Add $2492$ and $407$ .

$\frac{2899 + 421 + 435 + 452}{15}$

Step 2.12

Add $2899$ and $421$ .

$\frac{3320 + 435 + 452}{15}$

Step 2.13

Add $3320$ and $435$ .

$\frac{3755 + 452}{15}$

Step 2.14

Add $3755$ and $452$ .

$\frac{4207}{15}$

Step 3

Divide.

$280.4\overline{6}$

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.

$280.5$