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  Pick one.
A) 35.2
B) 36.1
C) 36.5
D) 39.1
E) None
Sol.   Therefore correct sum   = ( 36 × 50 + 48 – 23)   = 1825.   Therefore correct mean   = 1825 / 50   = 36.5.   Answer 36.5
<result>C</result>
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