The following table shows the percentage of marks obtained by seven students in six different subjects in an examination.

What are the average marks obtained by all the seven students in Physics? (rounded off to two digits after the decimal)

89.14

Total marks of all students in physics = 80% of 120 + 90% of 120 + 70% of 120 + 80% of 120 + 65% of 120 + 85% of 120 + 50% of 120

= \(\frac{4}{5}\) × 120 + \(\frac{9}{10}\) × 120 + \(\frac{7}{10}\) × 120 + \(\frac{4}{5}\) × 120 + \(\frac{13}{20}\) × 120 + \(\frac{17}{20}\) × 120 + \(\frac{1}{2}\) × 120

= 96 + 108 + 84 + 96 + 78 + 102 + 60

= 624

Average marks of all students in Physics = \(\frac{624}{7}\)

= 89.14