Lesson Averages

Source code of 'Averages'

This Lesson (Averages) was created by by courtneycheyenne(7)

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About courtneycheyenne: i love math.

The average of a group of numbers is defined as the sum of the values divided by the number of values.

Average value= Sum of the values
                          Number of values

Example:   Henry buys three items costing $2.00, $0.75, and $0.25. What is the average price?
Average price= Sum of Prices = Total price = $2.00+$0.75+$0.25
                    Number of prices     total items                    3
                                                   
                                                                      = $3.00 = $1.00
                                                                             3

If we know the average of a group of numbers in the group, we can find the sum of the numbers. It�s as if all the numbers in the group have the average value.
Sum of values=average value * (times) number of values

Example: The average daily temperature for the first week in January was 31 degrees. If the temperature for the first six days was 30 degrees, what was the temperature of the seventh day?

The sum for all 7 days = 31x7=217 degrees
The sum for the first 6 days = 30x6 = 180 degrees
The temperature of the seventh day = 217 � 180 = 37 degrees