Question (23/66)
For certain number of students, marks were wrongly entered as 83 instead of 63. Due to this error, the average marks for the class got increased by half. Find the number of students with wrongly entered marks ?(A) 10
(B) 20
(C) 30
(D) 40
Question (24/66)
The mean of 50 observations was 36. It was later found that an observation 48 was wrongly taken as 23. The correct new mean is ?(A) 35.2
(B) 36.1
(C) 36.5
(D) 39.1