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Mean

The average o...

Question

The average of seven numbers is 28. If one number is excluded, the average becomes 26. What is the excluded number?

A

38

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B

40

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C

42

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D

41

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E

36

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Solution

The correct option is B
40

Sum of 7 numbers =7 $\times$ 28

Sum of 6 numbers after excluding one number =6 $\times$ 26 (decreases by 2)

Excluded number =(7 $\times$ 28) -- (6 $\times$ 26) = 40.

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