Question 60

The mean of 30 observations was calculated as 150. Later, it was pointed out that value of one of the observations was wrongly taken as 135 instead of 165. The correct mean is

Solution

Mean of 30 observations = 150

For correcting the error, we need to subtract 135 and add 165,

=> New average = $$\frac{(150\times30)+165-135}{30}$$

= $$\frac{150\times30+30}{30}$$

= $$150+1=151$$

=> Ans - (B)

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