In an examination, out of 20 students in a class, in Mathematics 2 students scored 100 marks , 3 stu

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In an examination, out of $20$ students in a class, in Mathematics $2$ students scored $100$ marks $, 3$ students scored $0,$ and average marks for rest of the students was $40 .$ What is the average mark of the whole class ? (in $marks$)

A

$40$

B

$35$

C

$32$

D

$45$

Solution

Marks scored by $2$ students $=100 \times 2=200$

Marks scored by $3$ students $=3 \times 0=0$

Marks scored by $15$ students $=15 \times 40=600$

Marks scored by $20$ students $=200+0+600=800$

Average marks $=\frac{800}{20}=40$

Standard 13

Quantitative Aptitude

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