The following table gives the percentage of marks obtained by seven students in six different subjects in an examination.
The Numbers in the Brackets give the Maximum Marks in Each Subject.
What are the average marks obtained by all the seven students in Physics? (rounded off to two digits after decimal)
A.
77.26
B.
89.14
C.
91.37
D.
96.11
Correct answer is B
Average marks obtained in Physics by all the seven students
= 1/7 x [ (90% of 120) + (80% of 120) + (70% of 120) + (80% of 120) + (85% of 120) + (65% of 120) + (50% of 120) ]
= 1/7 x [ (90 + 80 + 70 + 80 + 85 + 65 + 50)% of 120 ]
= 1/7 x [ 520% of 120 ]
= 624/7
= 89.14