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 mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

A) 39 B) 39.7
C) 40.3 D) 42.7
 
Answer & Explanation Answer: B) 39.7

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Q:

The average cost of 4 items in a shopping list is Rs 1,250. If one more item whose cost is Rs 2,000 is added to the list what will be the new average (in
Rs)?

A) 1100 B) 1500
C) 1400 D) 1250
 
Answer & Explanation Answer: C) 1400

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Q:

The average weight of two players P and Q of a football team is 38 kg. The average weight of P, Q and their coach T is 49 kg. What is the weight (in kg) of coach?

A) 71 B) 46
C) 76 D) 91
 
Answer & Explanation Answer: A) 71

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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:

Average of 14 numbers is 32. If the average of last 5 numbers is 26, then what is the average of the remaining numbers?

A) 35.33 B) 41.33
C) 27.5 D) 44.5
 
Answer & Explanation Answer: A) 35.33

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Q:

The sum of a non-zero number and ten times its reciprocal is 7. Find the number.

A) 4 B) 3
C) 5 D) 6
 
Answer & Explanation Answer: C) 5

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Q:

A canteen requires 56 kgs of rice for seven days . The quantity of rice required for the months of April and May together is

A) 468 kg B) 488 kg
C) 498 kg D) 508 kg
 
Answer & Explanation Answer: B) 488 kg

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Q:

The average of 8 consecutive natural numbers is 38.5. What is the largest of these 8 numbers?

A) 41 B) 39
C) 42 D) 45
 
Answer & Explanation Answer: C) 42

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