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Question 61
The average of five consecutive numbers is m. If the next two numbers are also included, how shall the average vary?
Solution
The average of five numbers m-2,m-1,m,m+1,m+2 is m. When, the next two numbers are added the numbers are m-2,m-1,m,m+1,m+2,m+3,m+4 the average is (7m+7)/7=m+1.
So, I shall increase by 1.
There is an error in the options, even in the official exam. We can't resolve it.
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