18 , 18 , 17.5 , 19.5

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

18+18+17.5+19.54

Add 18 and 18.

36+17.5+19.54

Add 36 and 17.5.

53.5+19.54

Add 53.5 and 19.5.

734

734

Rewrite 73 as 1(73).

1(73)4

Cancel the common factors.

Rewrite 4 as 1(4).

1⋅731⋅4

Cancel the common factor.

1⋅731⋅4

Rewrite the expression.

734

734

734

Divide.

18.25

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.

18.3

Find the Mean (Arithmetic) 18 , 18 , 17.5 , 19.5