Average is very useful for summarizing any quantity. For example we can say temperature of the city. The city may have different temperature throughout the week. But if we want to give single figure for it or we want to summarize it then we are using average.

 

Basic formula for average is as shown below.

 

 

For example if we want to find average temperature of the city for the week.

 

Temperatures for the days of the week are

Sunday: 33 °C                  Monday: 34 °C

Tuesday: 35 °C                Wednesday: 36 °C

Thursday: 35 °C              Friday: 35 °C

Saturday: 36 °C

 

 

Here sum of all the temperature is divided by 7 because there are 7 days.

Here are some shortcut methods for average

Shortcut Methods For Average

Average of Numbers