the average of 9 observations was 9, that of the 1st of 5 being 10 and that of

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the average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. what was the 5th observation?

Options:

A . 9

B . 8

C . 7

D . 6

Answer: Option A
Explanation :

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