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 height of A, B and C is 148 cm. If the average height of A and B is 136 cm and that of B and C is 125 cm, then what is the height (in cm) of B?

A) 56 B) 78
C) 112 D) 130
 
Answer & Explanation Answer: B) 78

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Q:

The average of three numbers is 6. The average of the first two is 5 while the average of the last two is 8. The three numbers are:

A) 2, 6, 10 B) 3, 7, 8
C) 2, 8, 8 D) 2, 7, 9
 
Answer & Explanation Answer: C) 2, 8, 8

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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 average weight of 25 bags is 55 kg. The weight of one bag was misread as 65 instead of 56. Find the correct mean value.

A) 55.25 B) 55.36
C) 54.64 D) 55.65
 
Answer & Explanation Answer: C) 54.64

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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 the data 1, 2, 10, 18, 3, 17, 19 is

A) 7 B) 10
C) 17 D) 70
 
Answer & Explanation Answer: B) 10

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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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