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Quantitative Aptitude

Averages

In an examina...

Question

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 marks of the whole class?

40 marks

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35 marks

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32 marks

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45 marks

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None of these

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Solution

The correct option is A 40 marks
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
$= 20 + 0 + 600 = 800$
$∴$ Average marks $= \frac{800}{20} = 40$

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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 marks of the whole class?

The correct option is A 40 marksMarks scored by 2 students =100×2=200 Marks scored by 3 students = 3×0=0 Marks scored by 15 students =15×40=600 ∴ Marks scored by 20 students =20+0+600=800 ∴ Average marks =80020=40

The correct option is A 40 marks
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
$= 20 + 0 + 600 = 800$
$∴$ Average marks $= \frac{800}{20} = 40$