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. 35.2
B. 36.1
C. 36.5
D. 39.1
Ans: C.Sol.
Therefore correct sum
= ( 36 × 50 + 48 – 23)
= 1825.
Therefore correct mean
= 1825 / 50
= 36.5.
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