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:

In the first 36 overs of a cricket match, the run rate was 4.3 runs/over. Calculate the required run rate in the remaining 14 overs to reach the target of 271 runs?

A) 8.9 B) 9.5
C) 8.3 D) 7.7
 
Answer & Explanation Answer: C) 8.3

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Q:

The average of 7 numbers is 30. If the average of first three numbers is 25 and that of last three numbers is 35, then what is the fourth number?

A) 30 B) 35
C) 37.5 D) 40
 
Answer & Explanation Answer: A) 30

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Q:

The average weight of 30 students in a class is 25 kgs. If the weight of the class teacher is added, the average weight increase by 2 kgs. The weight of the class teacher in kgs is

A) 86 B) 84
C) 81 D) 87
 
Answer & Explanation Answer: D) 87

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Q:

The average revenues of 7 consecutive years of a company is Rs 71 lakhs. If the average of first 4 years is Rs 66 lakhs and that of last 4 years is Rs 78 lakhs. What is the revenue for the fourth year.

A) Rs 81 lakhs B) Rs 77 lakhs
C) Rs 79 lakhs D) Rs 75 lakhs
 
Answer & Explanation Answer: C) Rs 79 lakhs

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Q:

A line cuts the x­axis at the point (­3,0) and the y­axis at the point (0,6). What is the equation of the line?

A) x = 2y + 6 B) y = 2x ­- 6
C) x = 2y -­ 6 D) y = 2x + 6
 
Answer & Explanation Answer: D) y = 2x + 6

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Q:

The average revenues of 7 consecutive years of a company is Rs 79 lakhs. If the average of first 4 years is Rs 74 lakhs and that of last 4 years is Rs 86 lakhs, what is the revenue for the 4th year?

A) Rs 87 lakhs B) Rs 89 lakhs
C) Rs 85 lakhs D) Rs 83 lakhs
 
Answer & Explanation Answer: A) Rs 87 lakhs

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Q:

The sum of 15 observations of a data is (434 + x). If the mean of the data is x, then the value of x is

A) 31 B) 33
C) 27 D) 25
 
Answer & Explanation Answer: A) 31

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Q:

The mean of marks secured by 60 students in division A of class X is 64, 40 students of division B is 60 and that of 60 students of division C is 58. Find the mean of marks of the students of three divisions of Class X.

A) 60.05 B) 59.35
C) 62.15 D) 60.75
 
Answer & Explanation Answer: D) 60.75

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