The mean of 50 observations was 30. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is
Pick.
A) 35.2  B) 36.1  C) 30.5  D) 39.1  E) None
Sol.   Therefore correct sum   = ( 30 × 50 + 48 – 23)   = 1525.   Therefore correct mean   = 1525 / 50   = 30.5.   Answer 30.5
<result>C</result>
The mean of 50 observations was 30. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is