The average of 21 numbers is 66. The average of the first 9 numbers is – McqOptions

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1.	The average of 21 numbers is 66. The average of the first 9 numbers is 63.7 and that of the last 13 numbers is 69.9. If the 9th number is excluded, then what is the average of the remaining numbers?
A.	63
B.	64
C.	64.5
D.	63.5
Answer» D. 63.5

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