1.

The mean of certain number of observations is 46. If four observation whose mean is 52 are removed, the mean becomes 44.5. The original number of observation is 1. 35 2. 20 3. 15 4. 12

Answer»

Correct option is 2. 20

46n n (4 - 4) x 4.5 + 52 x4  

⇒  n = 20



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