Q. 4

The mean of a set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78. The value if discarded number is
A. 98

B. 99

C. 100

D. 101

Answer :

Let the discarded number be x,

= 81


(468 + x) = 567


x = 567 - 468


= 99

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