1.  The man 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

Answer: Option C

Explanation:

Correct sum = (36 x 50 + 48 - 23)

                  = 1825

Correct mean = 1825 = 36.5
50