Find the Mean 8 , 15 , 9 , 7 , 4 , 5 , 9 , 11

$8$ ,

$15$ ,

$9$ ,

$7$ ,

$4$ ,

$5$ ,

$9$ ,

$11$

Step 1

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

$\frac{8 + 15 + 9 + 7 + 4 + 5 + 9 + 11}{8}$

Step 2

Simplify the numerator.

Add

$8$ and

$15$ .

$\frac{23 + 9 + 7 + 4 + 5 + 9 + 11}{8}$

Add

$23$ and

$9$ .

$\frac{32 + 7 + 4 + 5 + 9 + 11}{8}$

Add

$32$ and

$7$ .

$\frac{39 + 4 + 5 + 9 + 11}{8}$

Add

$39$ and

$4$ .

$\frac{43 + 5 + 9 + 11}{8}$

Add

$43$ and

$5$ .

$\frac{48 + 9 + 11}{8}$

Add

$48$ and

$9$ .

$\frac{57 + 11}{8}$

Add

$57$ and

$11$ .

$\frac{68}{8}$

Step 3

Cancel the common factor of

$68$ and

$8$ .

Factor

$4$ out of

$68$ .

$\frac{4 (17)}{8}$

Cancel the common factors.

Factor

$4$ out of

$8$ .

$\frac{4 \cdot 17}{4 \cdot 2}$

Cancel the common factor.

$\frac{4 \cdot 17}{4 \cdot 2}$

Rewrite the expression.

$\frac{17}{2}$

Step 4

Divide.

$8.5$

Find the Mean 8 , 15 , 9 , 7 , 4 , 5 , 9 , 11

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