The average of 9 observations was 9, that of the first 5 being 10 and that of the last 5 being 8. What was the 5th observation? Options: A . &nbsp7 B . &nbsp8 C . &nbsp9 D . &nbsp10

The average of 9 observations was 9, that of the first 5 being 10 and that of

Question

The average of 9 observations was 9, that of the first 5 being 10 and that of the last 5 being 8. What was the 5th observation?

Options:

A . 7

B . 8

C . 9

D . 10

Answer: Option C

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Gagan 2018-07-10 02:20:04

(10*5+8*5)-9*9
(50+40)-81
90-81
9

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