The mean of 5 observations is 7. If mean of the first three observations is 5 and that of the last three is 9, then the third observation is.

The mean of 5 observations is 7. If mean of the first three observatio

1.	The mean of 5 observations is 7. If mean of the first three observations is 5 and that of the last three is 9, then the third observation is.
A.	5
B.	10
C.	7
D.	9
Answer» D. 9

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The mean of 5 observations is 7. If mean of the first three observations is 5 and that of the last three is 9, then the third observation is.

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