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 median of the numbers 14, 12, 12, 16, 13 and 18 is

A) 13 B) 14
C) 14.5 D) 13.5
 
Answer & Explanation Answer: D) 13.5

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Q:

a, b and c are 3 values, such that a + b = 5, b + c = 7.5 and c + a = 8.5. What will be the average of these values?

A) 1.5 B) 3
C) 3.5 D) 4.5
 
Answer & Explanation Answer: C) 3.5

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Q:

What is the average of 90, 250, 240, 204, and 616?

A) 280 B) 210
C) 230 D) 255
 
Answer & Explanation Answer: A) 280

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Q:

In the first 43 overs of a cricket match, the run rate was 5 runs/over. Calculate the required run rate in the remaining 7 overs to reach the target of 285 runs?

A) 10.6 B) 11.2
C) 10 D) 9.4
 
Answer & Explanation Answer: C) 10

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Q:

The average temperature for Monday, Tuesday, Wednesday and Thursday was 48° . The average temperature for Tuesday, Wednesday, Thursday and Friday was 52°, If the temperature on Monday was 42°, then the temperature on Friday was (in degrees)

A) 58 B) 56
C) 52 D) 50
 
Answer & Explanation Answer: A) 58

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Q:

The average revenues of 9 consecutive years of a company is Rs 65 lakhs. If the average of first 5 years is Rs 60 lakhs and that of last 5 years is Rs 72 lakhs, find the revenue for the 5th year.

A) Rs 77 lakhs B) Rs 75 lakhs
C) Rs 73 lakhs D) Rs 71 lakhs
 
Answer & Explanation Answer: B) Rs 75 lakhs

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Q:

The average marks obtained by a group of 10 students were 20. One student left the group as a result of which the average of the remaining students rose to 21. But another student joined, as a result of which the average marks of the group dropped a bit and became 20.6. What were the average marks obtained by the student who left and the one who joined?

 

A) 14 B) 15
C) 16 D) 23
 
Answer & Explanation Answer: A) 14

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Q:

What is the mean of the first five Triangular Numbers?

A) 8 B) 7
C) 6 D) 5
 
Answer & Explanation Answer: B) 7

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