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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

(a) 20             (b) 25             (c) 30             (d) 40


Question ID - 50649 | Toppr Answer

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

(a) 20             (b) 25             (c) 30             (d) 40

1 Answer - 5876 Votes

3537

Answer Key : (c) -

Required mean =



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