# Simple tricks to calculate average of numbers #### AVERAGE

• An average or more accurately an arithmetic mean is, in crude terms, the sum of n different data divided by  n
• Averages of a group is defined as the ratio of the sum of all the items in the group to the number of items in the group.
• Average=(Number of items in the group )/(Sum of all items in the group)

​                 Now, the sum of all items can be the sum of a number of quantities like apple, people etc or sum of values of the item like 10 coins of 2Rs each etc’.

• ##### :
• Average =total of data  /  No. ofdata
•   If the value of each item is increase by the same value a, then the average of the group or items will also increase by a.
•  If the value of each item is decreased by the same value a, then the average of the group of items will also decrease by a.
•  If the value of each item is multiplied by the same value a, then the average of the group or items will also get multiplied by a.
•  If the value of each item is divided by the same value a, then the average of the group or items will also get divided by a.
•  If we know only the average of the two groups individually, we cannot find out the average of the combined group of items.
•  = (
• Average of even No’s
•  = n
•  ={First number +Last number}/

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#### A cricketer has a certain average of runs for his 8 innings. In the ninth innings he scores 100 runs there by increases his average by 5 runs. What is the earlier average of runs is

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average
Perfect calculations...! Amazing
You are a fast learner.Keep Doing
Good trial ! Try to concentrate more