The average marks of a class of 30 students is 40 and that of another class of 50 students is 60. Find the average marks of all the students?
Options:
A . 50
B . 47.5
C . 59
D . 52.5
Answer: Option D
Sum of the marks for the class of 30 students = 30 * 40 = 1200 Sum of the marks for the class of 50 students = 50 * 60 = 3000 Sum of the marks for the class of 80 students = 1200 + 3000 = 4200 Average marks of all the students = 4200/80 = 52.5
Submit Comment/FeedBack