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 the 5 smallest numbers from a group is 15 while the mean of all the 13 members of the group taken together is 17. What is the mean of the 8 largest numbers?

A) 18.50 B) 17.75
C) 18.75 D) 18.25
 
Answer & Explanation Answer: D) 18.25

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5 932
Q:

The median of the data -3, 4, 0, 4, -2, -5, 1, 7, 10, 5 is

A) 2 B) 2.5
C) 2.75 D) 3
 
Answer & Explanation Answer: B) 2.5

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0 782
Q:

Average of the marks of 132 students of a college is 40. If the average of the marks of the passed students is 42 and the average of the marks of the failed students is 20, then what will be the respective ratio of the total marks of passed students and the total marks of failed students?

 

A) 21 : 1   B) 23 : 2
C) 19 : 11 D) 9 : 2
 
Answer & Explanation Answer: A) 21 : 1  

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2 907
Q:

The average marks obtained by a group of 16 students was 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 20.5. What was the average marks obtained by the student who left and the one who joined?

A) 10 B) 11
C) 8 D) 9
 
Answer & Explanation Answer: D) 9

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4 1219
Q:

The mean of the data 1, 1/2, 1/2, 3/4, 1/4, 2, 1/2, 1/4, 3/4 is

A) 15/18 B) 13/18
C) 7/9 D) 8/9
 
Answer & Explanation Answer: B) 13/18

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4 888
Q:

What will be the average of the first 7 positive odd numbers divisible by 5?

 

A) 45 B) 35
C) 40 D) 32
 
Answer & Explanation Answer: B) 35

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0 11274
Q:

What will be the average of all the prime numbers before 19?

A) 8.28 B) 11.5
C) 5.34 D) 9.63
 
Answer & Explanation Answer: A) 8.28

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2 864
Q:

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

 

A) 19 B) 18
C) 17 D) 16
 
Answer & Explanation Answer: A) 19

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