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:

A batsman has a certain average of runs for 12 innings. In the 13th inning he scores 96 runs thereby increasing his average by 5 runs. What will be his average after 13th inning?

A) 28 B) 32
C) 36 D) 42
 
Answer & Explanation Answer: C) 36

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Q:

The average weight of two players P and Q of a football team is 38 kg. The average weight of P, Q and their coach T is 49 kg. What is the weight (in kg) of coach?

A) 71 B) 46
C) 76 D) 91
 
Answer & Explanation Answer: A) 71

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Q:

The average of 100 items was found to be 30 . If at the time of calculation , two items were wrongly taken as 32 and 12 instead of 23 and 11 , then the correct average is

A) 29.8 B) 29
C) 29.9 D) 29.5
 
Answer & Explanation Answer: C) 29.9

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Q:

In a marriage party 32% are women, 54% are men and there are 196 children. How many men are there in the marriage party?

A) 756 B) 448
C) 332 D) 324
 
Answer & Explanation Answer: A) 756

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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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Q:

The average of four consecutive odd numbers is 64. What is the value of largest number?

A) 65 B) 69
C) 71 D) 67
 
Answer & Explanation Answer: D) 67

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Q:

The average weight of Somdev, Gurdeep and Ritu is 85 kg. If the average weight of Somdev and Gurdeep be 79 kg and that of Gurdeep and Ritu be 73 kg, then the weight of Gurdeep is

A) 78 B) 49
C) 72 D) 90
 
Answer & Explanation Answer: B) 49

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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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