Question

The mean marks obtained by 300 students in a subject are 60. The mean of top 100 students was found to be 80 and the mean of last 100 students was found to be 50. The mean marks of the remaining 100 students are:

• A. 70
• B. 65
• C. 60
• D. 50

Answer 1

Answer:

D. 50

Total marks of 300 students = 300 × 60 = 18000 Total marks of top 100 students = 100 × 80 = 8000 Total marks of last 100 students = 100 × 50 = 5000 Sum of marks of remaining 100 students = 18000 - 5000 - 8000 = 5000 Mean of remaining 100 students = 5000/100 = 50