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

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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-

Options:

A . 20

B . 25

C . 30

D . 40

Answer: Option C

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