The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is :

A 35

B 36.5

C 40

D 42

Solution

Correct Answer: Option B

Correct Sum = (36 \(\times\) 50 + 48 - 23) = 1825.

Correct mean = = 1825/50 = 36.5