The average of twenty results is 18, that of first 9 is Hand that of l – McqOptions

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1.	The average of twenty results is 18, that of first 9 is Hand that of last 9 is 17. The average of middle two results is
A.	45
B.	50.5
C.	40.5
D.	51.5
Answer» D. 51.5

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