An average is determined by adding up the sum of a set of digits and then dividing that sum by the number of digits that you have. For example the average for the following numbers is:

3, 7, 4, 10, 15, 9

Sum = 48

# of Digits = 6

Average = 48/6 = 8

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Averages

Work through the following tests to make sure you are comfortable with the material.

Practice Exercise:

Determine the averages of the following sets of numbers:

1) 4, 6, 12, 15, 20

2) 3, 8, 13

3) 18, 22, 1, 16, 56, 100

4) 5, 9, 10, 22, 43, 50

5) 2, 6, 17, 2, 5, 17

6) 13, 2, 75, 8, 10

7) 4, 5, 9, 8

8) 10, 20, 30, 40, 50

9) 9, 2, 1, 9, 42, 11

10) 8, 19, 7, 4, 100

Answers:

1) 4, 6, 12, 15, 20 = 11.4

2) 3, 8, 13 =8

3) 18, 22, 1, 16, 56, 100 = 35.5

4) 5, 9, 10, 22, 43, 50 = 23.167

5) 2, 6, 17, 2, 5, 17 = 8.167

6) 13, 2, 75, 8, 10 = 21.6

7) 4, 5, 9, 8 = 6.5

8) 10, 20, 30, 40, 50 = 30

9) 9, 2, 1, 9, 42, 11 = 12.3

10) 8, 19, 7, 4, 100 = 27.6