Q. In a class of 50 students, 10 have failed and their average marks are 28. The total marks obtained by the entire class are 2800. The average marks of those who have passed, are
A) 43
B) 53
C) 63
D) 70
Explanation
(c)
$\because$ Total marks of 10 failed students $= 28 \times 10 = 280$
and Total marks of 50 students $= 2800$
$\therefore$ Total marks of 40 passed students $= 2800 - 280 = 2520$
$\therefore$ Average marks of 40 passed students $= \frac{2520}{40} = 63$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.