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

Question

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

1 to 9 = 9 * 9 = 81

1 to 5 = 5 * 10 = 50

5 to 9 = 5 * 8 = 40

5^th = 50 + 40 = 90 “ 81 =
9

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