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4.Average
medium
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
