The mean of 5 observations is 60 the mean of 10…

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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-

  1. A. 20
  2. B. 25
  3. C. 30
  4. D. 40

Answer: Option C

Here is complete explanation of The mean of 5 observations is 60 the mean of 10….

Solution(By ExamCraze Team)

Required mean
$$eqalign{ & = left( {frac{{60 times 5 + 30 times 10 + 20 times 15}}{{5 + 10 + 15}}} right) cr & = left( {frac{{300 + 300 + 300}}{{30}}} right) cr & = left( {frac{{900}}{{30}}} right) cr & = 30 cr} $$

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