FACTS  AND  FORMULAE  FOR  AVERAGE QUESTIONS

 

 

1. Average =Sum of observationsNo. of observations

2. Suppose a man covers a certain distance x kmph and an equal distance at y kmph. Then, the average speed during the whole journey is2xyx+yKmph

Q:

Of the 5 subjects, the average marks of Rakesh in first 3 Subjects was 79 and the average marks in the last 3 subjects was 86. If his marks in the third subject was 80, then what was his average marks in all the 5 subjects?

A) 81 B) 82
C) 83 D) 85
 
Answer & Explanation Answer: C) 83

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Q:

In a class of 66 students there are 33 girls. The average weight of these girls is 61 Kg and average weight of the full class is 66 kgs. What is the average weight of the boys of the class?

A) 72 B) 73
C) 69 D) 71
 
Answer & Explanation Answer: D) 71

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Q:

The average of a,b,c is 20 and that of b,c,d is 25; if d=30, then the value of a is

A) 25 B) 45
C) 30 D) 15
 
Answer & Explanation Answer: D) 15

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Q:

If the average age of 20 students in Class-I is 10 years and average age of 25 students in Class II is 12 years, find the average age (in years) of all students.

A) 11 B) 11.111
C) 10.50 D) 10.85
 
Answer & Explanation Answer: B) 11.111

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Q:

What is the average of all natural numbers from 21 to 39?

A) 30 B) 31
C) 29 D) 28
 
Answer & Explanation Answer: A) 30

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Q:

What is the average of all numbers between 11 and 80 which are divisible by 6?

A) 46 B) 47
C) 44 D) 45
 
Answer & Explanation Answer: D) 45

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Q:

A librarian purchased 60 story books for his library. But he found that he could get 4 extra books by spending Rs 336 more and then the overall average price per book would be reduced by Re 1. The previous average price of each book was

A) Rs 84 B) Rs 83
C) Rs 68 D) Rs 100
 
Answer & Explanation Answer: D) Rs 100

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Q:

In a class, there were 9 boys and some girls. In a test the mean score obtained by the boys was 12 while that obtained by the girls was 14. If the overall average was 13.1, what was the total number of students in the calss?

A) 21 B) 20
C) 22 D) 19
 
Answer & Explanation Answer: B) 20

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