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:

The average of 8 consecutive natural numbers is 38.5. What is the largest of these 8 numbers?

A) 41 B) 39
C) 42 D) 45
 
Answer & Explanation Answer: C) 42

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Q:

A group of boys has an average weight of 36 kg. One boy weighing 42 kg leaves the group and another boy weighing 30 kg joins the group. If the average now becomes 35.7 kg, then how many boys are there in the group?

A) 30 B) 32
C) 40 D) 56
 
Answer & Explanation Answer: C) 40

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Q:

The value of (2+32-3-342) is 

A) 36 B) 336
C) 49 D) 49+3
 
Answer & Explanation Answer: C) 49

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Q:

In a class of 55 students there are 34 girls. The average weight of these girls is 51 Kg and average weight of the full class is 55.2 kgs. What is the average weight of the boys of the class?

A) 62 B) 59.4
C) 56.8 D) 60
 
Answer & Explanation Answer: A) 62

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Q:

In the first 45 overs of a 50 over innings, the run rate was 5.8 runs per over. What is the required run rate in the remaining overs to reach the target of 295 runs?

A) 6.9 B) 6.8
C) 6.7 D) 6.6
 
Answer & Explanation Answer: B) 6.8

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Q:

The mean of marks secured by 60 students in division A of class X is 66, 45 students of division B is 62 and that of 75 students of division C is 60. Find the mean of marks of the students of three divisions of Class X.

A) 61.8 B) 62.5
C) 61.1 D) 63.9
 
Answer & Explanation Answer: B) 62.5

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Q:

If a+1a=2 then the vealue of a5+1a5 will be

A) 0 B) 1
C) 3 D) 2
 
Answer & Explanation Answer: B) 1

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Q:

The average (arithmetic mean) amount of savings of ten students is Rs. 600. Three of the students have no savings at all and each of the others have at least Rs. 250 including Nihar, who has exactly Rs. 1300. The largest amount, in Rs., that any one student could have is

A) 3250 B) 3450
C) 3650 D) 3850
 
Answer & Explanation Answer: B) 3450

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