No. of students = 50
Mean marks secured by them = 39
Incorrect sum of marks secured = 39 × 50 = 1950.
Correct sum = incorrect sum – (incorrect marks) + correct marks
= 1950 – 23 + 43 = 1970
Correct mean = 39.4.
Rate this question :
How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Frequency Distribution Table58 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
view all courses
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation