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 revenues of 13 consecutive years of a company is Rs 82 lakhs. If the average of first 7 years is Rs 77 lakhs and that of last 7 years is Rs 89 lakhs, find the revenue for the 7th year.

A) Rs 98 lakhs B) Rs 96 lakhs
C) Rs 94 lakhs D) Rs 92 lakhs
 
Answer & Explanation Answer: B) Rs 96 lakhs

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Q:

The average marks of 10 students in an examination was 25. It was later found that the marks of one student had been wrongly entered as 34 instead of 43. What is the correct average?

A) 25.5 B) 24.1
C) 24.5 D) 25.9
 
Answer & Explanation Answer: D) 25.9

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Q:

The mean of marks secured by 35 students in division A of class X is 65, 45 students of division B is 61 and that of 70 students of division C is 59. What is the mean of marks of the students of three divisions of Class X?

A) 60.3 B) 59.6
C) 61 D) 62.4
 
Answer & Explanation Answer: C) 61

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Q:

A factory buys 8 machines. 3 Machine­A, 4 Machine­B and rest Machine­C. Prices of the machines are Rs 45000, Rs 25000 and Rs 35000 respectively. Calculate the average cost (in Rs) of these machines?

A) 33750 B) 35000
C) 36250 D) 32250
 
Answer & Explanation Answer: A) 33750

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Q:

The average revenues of 7 consecutive years of a company is Rs 83 lakhs. If the average of first 4 years is Rs 78 lakhs and that of last 4 years is Rs 90 lakhs, find the revenue for the 4th year.

A) Rs 91 lakhs B) Rs 93 lakhs
C) Rs 89 lakhs D) Rs 87 lakhs
 
Answer & Explanation Answer: A) Rs 91 lakhs

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Q:

Find the value of '?, if the mean of the data set 18, 16, 22, 13, ? = 16.

A) 9 B) 11
C) 10 D) 12
 
Answer & Explanation Answer: B) 11

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Q:

The median of the numbers 4, 2, 2, 6, 3 and 8 is

A) 4.5 B) 3.5
C) 4 D) 3
 
Answer & Explanation Answer: B) 3.5

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Q:

Four numbers A, B, C and D are such that their overall average is 16. The average of A and B is 9.5. The average of C and D is

A) 22.5 B) 23
C) 21.5 D) 25.5
 
Answer & Explanation Answer: A) 22.5

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