13
Q:

Of the following, which is greater than ½ ?

Indicate ALL such fractions.

A) 2/5 B) 4/7
C) 4/9 D) 5/11

Answer:   B) 4/7



Explanation:

One way to deal with fractions is to convert them all to decimals. 

In this case all you would need to do is to see which is greater than 0.5.

Otherwise to see which is greater than ½, double the numerator and see if the result is greater than the denominator. In B doubling the numerator gives us 8, which is bigger than 7. 

Subject: Average
Exam Prep: GRE
Q:

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

A) 20 B) 24
C) 26 D) 28
 
Answer & Explanation Answer: C) 26

Explanation:
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2 1063
Q:

A boy spends Rs 20 to purchase toffees at Rs 1 each. Next day, he purchased some toffees for Rs 40 with a discount of 50 paise per toffee. What is the average price per toffee (in paise)?

A) 45 B) 60
C) 40 D) 55
 
Answer & Explanation Answer: B) 60

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3 944
Q:

Find the average of all prime numbers from 1 to 50.

A) 21.867 B) 22.857
C) 23.887 D) 24.867
 
Answer & Explanation Answer: A) 21.867

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3 721
Q:

Find the mean and mode of the numbers 1, 9, 5, 4, 2, 1, 9, 9, 2, 1, 9, 1, 2, 1?

A) 4 & 9 B) 5 & 1
C) 4 & 1 D) 5 & 9
 
Answer & Explanation Answer: C) 4 & 1

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7 875
Q:

The runs scored by two batsmen over 7 matches are given below. Which batsman average was better ?

 

A) Batsman 1 - 39.3 B) Batsman 1 - 45.9
C) Batsman 1 - 43.2 D) Batsman 2 - 45.9
 
Answer & Explanation Answer: D) Batsman 2 - 45.9

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1 7531
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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1 970
Q:

The average of 10 numbers is 30. If at the time of calculation one number was wrongly taken as 36 instead of 69, then what will be the correct average?

A) 33 B) 33.3
C) 36 D) 39
 
Answer & Explanation Answer: B) 33.3

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2 801
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

Explanation:
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7 1185