the average of 5 cosecutive numbers is n. if the next two numbers are also included what is the increase in average?
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Average is the sum of observations divided by the number of observations. Therefore 5x+10=5n and after solving this equation we get x=n−2. When we add the next two numbers, we get 5x+10+x+5+x+6=7x+21. Therefore, the new average is 7x+217=x+3.
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