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 runs conceded by a bowler in 5 matches is 45 and 15.75 in other 4 matches. What is the average runs conceded by the bowler in 9 matches?

A) 15 B) 32
C) 35 D) 53.5
 
Answer & Explanation Answer: B) 32

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Q:

What is the average of 36, 43, 51, 68, and 77?

A) 47 B) 49
C) 55 D) 64
 
Answer & Explanation Answer: C) 55

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Q:

Average of all even numbers between 222 and 250 is __________.

A) 234 B) 232
C) 236 D) 230
 
Answer & Explanation Answer: C) 236

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Q:

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observations is

A) 28 B) 42
C) 35 D) 45
 
Answer & Explanation Answer: B) 42

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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:

What is the average of all the one digit and two digit natural numbers?

A) 25 B) 40
C) 50 D) 99
 
Answer & Explanation Answer: C) 50

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Q:

In a class of 50 students there are 27 boys. The average weight of these boys is 72 Kg and average weight of the full class is 55.44 kgs. What is the average weight (in kgs) of the girls of the class?

A) 42 B) 48
C) 30 D) 36
 
Answer & Explanation Answer: D) 36

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Q:

The average revenues of 7 consecutive years of a company is Rs 75 lakhs. If the average of first 4 years is Rs 70 lakhs and that of last 4 years is Rs 82 lakhs, what will be the revenue for the 4th year.

A) Rs 85 lakhs B) Rs 83 lakhs
C) Rs 81 lakhs D) Rs 79 lakhs
 
Answer & Explanation Answer: B) Rs 83 lakhs

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