The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean – OfficerPath

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The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of all the 30 observations is-

Subject: MathematicsTopic: Average

A

20

B

25

C

30

D

40

Correct Answer: C

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