Basic Math Examples

$19$ ,

$20$ ,

$21$ ,

$22$ ,

$23$ ,

$24$ ,

$25$ ,

$26$ ,

$27$ ,

$28$ ,

$29$ ,

$30$

Step 1

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

$\frac{19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2

Simplify the numerator.

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Step 2.1

Add

$19$ and

$20$ .

$\frac{39 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.2

Add

$39$ and

$21$ .

$\frac{60 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.3

Add

$60$ and

$22$ .

$\frac{82 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.4

Add

$82$ and

$23$ .

$\frac{105 + 24 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.5

Add

$105$ and

$24$ .

$\frac{129 + 25 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.6

Add

$129$ and

$25$ .

$\frac{154 + 26 + 27 + 28 + 29 + 30}{12}$

Step 2.7

Add

$154$ and

$26$ .

$\frac{180 + 27 + 28 + 29 + 30}{12}$

Step 2.8

Add

$180$ and

$27$ .

$\frac{207 + 28 + 29 + 30}{12}$

Step 2.9

Add

$207$ and

$28$ .

$\frac{235 + 29 + 30}{12}$

Step 2.10

Add

$235$ and

$29$ .

$\frac{264 + 30}{12}$

Step 2.11

Add

$264$ and

$30$ .

$\frac{294}{12}$

Step 3

Cancel the common factor of

$294$ and

$12$ .

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Step 3.1

Factor

$6$ out of

$294$ .

$\frac{6 (49)}{12}$

Step 3.2

Cancel the common factors.

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Step 3.2.1

Factor

$6$ out of

$12$ .

$\frac{6 \cdot 49}{6 \cdot 2}$

Step 3.2.2

Cancel the common factor.

$\frac{6 \cdot 49}{6 \cdot 2}$

Step 3.2.3

Rewrite the expression.

$\frac{49}{2}$

Step 4

Divide.

$24.5$