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 9 consecutive years of a company is Rs 80 lakhs. If the average of first 5 years is Rs 75 lakhs and that of last 5 years is Rs 87 lakhs, find the revenue for the 5th year.

A) Rs 90 lakhs B) Rs 92 lakhs
C) Rs 88 lakhs D) Rs 86 lakhs
 
Answer & Explanation Answer: A) Rs 90 lakhs

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Q:

A batsman scores 98 runs in the 17th match of his career. His average runs per match increased by 2.5. What is his average before the 17th match?

A) 58 B) 60.5
C) 63 D) 55.5
 
Answer & Explanation Answer: D) 55.5

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Q:

If a certain amount is fully distributed among A, B & C in such a way that A receives 1/2 of the amount, B receives 1/3 of the amount and C receives ₹ 1200, then how much money would A receive

A) 4000 B) 1600
C) 3600 D) 1800
 
Answer & Explanation Answer: C) 3600

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Q:

The average revenues of 11 consecutive years of a company is Rs 69 lakhs. If the average of first 6 years is Rs 64 lakhs and that of last 6 years is Rs 76 lakhs, what is the revenue for the 6th year?

A) Rs 83 lakhs B) Rs 79 lakhs
C) Rs 77 lakhs D) Rs 81 lakhs
 
Answer & Explanation Answer: D) Rs 81 lakhs

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Q:

The mode and median of the data 8, 6, 8, 7, 8, 6, 8, 7, 6 is

A) 7 and 8 B) 6 and 7
C) 8 and 7 D) 6 and 8
 
Answer & Explanation Answer: C) 8 and 7

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Q:

Of the 5 numbers whose average is 72, the first is 1/8 times the sum of other 4. The first number is _____.

A) 60 B) 26
C) 40 D) 80
 
Answer & Explanation Answer: C) 40

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Q:

The average of 6 consecutive integers is 15/2. What is the average of last three integers?

A) 8 B) 9
C) 17/2 D) 7
 
Answer & Explanation Answer: B) 9

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Q:

The average temperature of Monday ,Tuesday , Wednesday and Thursday is 60°, The average for Tuesday, Wednesday, Thursday and Friday is 63°; If the ratio of temperature for Monday and Friday is 21 : 25, then what is the temperature of Friday ?

A) 70° B) 73°
C) 75° D) 78°
 
Answer & Explanation Answer: C) 75°

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