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:

In a class of 60 students there are 20 girls who scored an average of 40 marks in the test, what is the average marks of the boys if the class average is 60 marks?

A) 60 B) 70
C) 50 D)
 
Answer & Explanation Answer: B) 70

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Q:

The average of 41 consecutive odd numbers is 49. What is the largest number.

A) 89 B) 91
C) 93 D) 95
 
Answer & Explanation Answer: A) 89

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Q:

The average marks of 18 students in an examination was 60. It was later found that the marks of one student had been wrongly entered as 63 instead of 36. The correct average is:

A) 59 B) 59.5
C) 58 D) 58.5
 
Answer & Explanation Answer: D) 58.5

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Q:

The average weight of Shubha, Govinda and Reshma is 65 kg. If the average weight of Shubha and Govinda be 63 kg and that of Govinda and Reshma be 70 kg, then the weight of Govinda is

A) 41 B) 71
C) 88 D) 46
 
Answer & Explanation Answer: B) 71

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Q:

If the average age of 20 students in Class-I is 10 years and average age of 25 students in Class II is 12 years, find the average age (in years) of all students.

A) 11 B) 11.111
C) 10.50 D) 10.85
 
Answer & Explanation Answer: B) 11.111

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Q:

In a class of 100 students, the average weight is 30 kg. If the average weight of the girls is 24 kg and that of the boys is 32 kg, then what is the number of girls in the class?

A) 25 B) 26
C) 27 D) 28
 
Answer & Explanation Answer: A) 25

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Q:

The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. what is the correct average?

A) 33.1 B) 33.3
C) 33.5 D)  33.7
 
Answer & Explanation Answer: A) 33.1

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Q:

In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?

A) 50 B) 52.5
C) 47.5 D) 55
 
Answer & Explanation Answer: C) 47.5

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