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 monthly salary of 19 members of a group is Rs. 16000. If one more members whose monthly salary is Rs. 20000 has joined the group, then the average salary of the group is

A) Rs.18250 B) Rs.16200
C) Rs.18000 D) Rs.16250
 
Answer & Explanation Answer: B) Rs.16200

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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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1 1029
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:

Find the mean value of 2, 3, 3, 4, 6, 7

A) 4.17 B) 4.15
C) 4.13 D) 4.70
 
Answer & Explanation Answer: A) 4.17

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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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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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2 995
Q:

A factory buys 10 machines. 2 Machine­A, 3 Machine­B and rest Machine­C. Prices of the machines are Rs 95000, Rs 60000 and Rs 50000 respectively. What is the average cost of these machines?

A) 62000 B) 68333
C) 74666 D) 60500
 
Answer & Explanation Answer: A) 62000

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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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