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The average of 21 number is 66. The aver...

The average of 21 number is 66. The average of the first 9 numbers is 63.7 and that of the last 13 number is 69.9 . If the `9^(th)` number is excluded, then what is the average of the remaining numbers?

A

63

B

64

C

`64.5`

D

`63.5`

Text Solution

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The correct Answer is:
C
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