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

77.26

89.14

91.37

96.11

Answer : Option B

Explanation :

Average marks obtained in Physics by all the seven students

= $\frac { 1 } {7}$ x [(90% of 120) + (80% of 120) + (70% of 120) + (80% of 120) + (85% of 120) + (65% of 120) + (50% of 120) ]

= $\frac { 1 } {7}$ x [ (90 + 80 + 70 + 80 + 85 + 65 + 50)% of 120 ]

= $\frac { 1 } {7}$ x [ 520% of 120 ]

= $\frac {624 } { 7 }$

= 89.14

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