Basic Math Examples

31

$31$ ,

28

$28$ ,

27

$27$ ,

26

$26$ ,

32

$32$ ,

29

$29$ ,

25

$25$ ,

27

$27$

Step 1

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

\frac{31 + 28 + 27 + 26 + 32 + 29 + 25 + 27}{8}

$\frac{31 + 28 + 27 + 26 + 32 + 29 + 25 + 27}{8}$

Step 2

Simplify the numerator.

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Step 2.1

Add

31

$31$ and

28

$28$ .

\frac{59 + 27 + 26 + 32 + 29 + 25 + 27}{8}

$\frac{59 + 27 + 26 + 32 + 29 + 25 + 27}{8}$

Step 2.2

Add

59

$59$ and

27

$27$ .

\frac{86 + 26 + 32 + 29 + 25 + 27}{8}

$\frac{86 + 26 + 32 + 29 + 25 + 27}{8}$

Step 2.3

Add

86

$86$ and

26

$26$ .

\frac{112 + 32 + 29 + 25 + 27}{8}

$\frac{112 + 32 + 29 + 25 + 27}{8}$

Step 2.4

Add

112

$112$ and

32

$32$ .

\frac{144 + 29 + 25 + 27}{8}

$\frac{144 + 29 + 25 + 27}{8}$

Step 2.5

Add

144

$144$ and

29

$29$ .

\frac{173 + 25 + 27}{8}

$\frac{173 + 25 + 27}{8}$

Step 2.6

Add

173

$173$ and

25

$25$ .

\frac{198 + 27}{8}

$\frac{198 + 27}{8}$

Step 2.7

Add

198

$198$ and

27

$27$ .

\frac{225}{8}

$\frac{225}{8}$

\frac{225}{8}

$\frac{225}{8}$

Step 3

Divide.

28.125

$28.125$

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.

28.1

$28.1$