Basic Math Examples

$69$ , $72$ , $70$ , $63$ , $87$ , $73$ , $65$ , $81$ , $75$ , $82$ , $85$ , $66$ , $64$ , $82$ , $61$

Step 1

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

$\frac{69 + 72 + 70 + 63 + 87 + 73 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2

Simplify the numerator.

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Step 2.1

Add $69$ and $72$ .

$\frac{141 + 70 + 63 + 87 + 73 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.2

Add $141$ and $70$ .

$\frac{211 + 63 + 87 + 73 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.3

Add $211$ and $63$ .

$\frac{274 + 87 + 73 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.4

Add $274$ and $87$ .

$\frac{361 + 73 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.5

Add $361$ and $73$ .

$\frac{434 + 65 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.6

Add $434$ and $65$ .

$\frac{499 + 81 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.7

Add $499$ and $81$ .

$\frac{580 + 75 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.8

Add $580$ and $75$ .

$\frac{655 + 82 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.9

Add $655$ and $82$ .

$\frac{737 + 85 + 66 + 64 + 82 + 61}{15}$

Step 2.10

Add $737$ and $85$ .

$\frac{822 + 66 + 64 + 82 + 61}{15}$

Step 2.11

Add $822$ and $66$ .

$\frac{888 + 64 + 82 + 61}{15}$

Step 2.12

Add $888$ and $64$ .

$\frac{952 + 82 + 61}{15}$

Step 2.13

Add $952$ and $82$ .

$\frac{1034 + 61}{15}$

Step 2.14

Add $1034$ and $61$ .

$\frac{1095}{15}$

Step 3

Divide $1095$ by $15$ .

$73$