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? - Study24x7
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1009 followers study24x7 20 Apr 2021 02:34 PM study24x7 study24x7

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?

A

9

B

8

C

7

D

6

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