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Question

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


A
77.26
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B
89.14
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C
91.37
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D
96.11
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Solution

The correct option is C $$89.14$$
Average marks obtained in Physics by all the seven students
$$= \dfrac {1}{7} \times [90$$% of $$120) + (80$$% of $$120) + (70$$% of $$120) + (80$$% of $$120) + (85$$% of $$120) + (65$$% of $$120) + (50$$% of $$120)]$$
$$= \dfrac {1}{7} \times [90 + 80 + 70 + 80 + 85 + 65 + 50)$$% of $$120]$$
$$= \dfrac {1}{7}\times (520$$% of $$120]$$
$$= \dfrac {624}{7}$$
$$= 89.14$$.

Mathematics

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