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If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x

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If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 15 Feb 2013, 11:01
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If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x could be

A. 16/5
B. 17/5
C. 4
D. 30/7
E. 31/7
[Reveal] Spoiler: OA

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Last edited by Bunuel on 16 Feb 2013, 02:52, edited 1 time in total.
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 29 Mar 2013, 09:29
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VeritasPrepKarishma wrote:

The median is the middle number once all the numbers are arranged in increasing/decreasing order.
We see that
11/3 = 3.something,
28/9 = 3.something
21/5 = 4.something
9/2 = 4.something

So x should greater than the smallest two numbers and smaller than the greatest two numbers. We can see that x = 4 is possible. (First look at the simplest option or the middle option since options are usually arranged in increasing/decreasing order)
Answer (C)


The median could be some number such as 4.01 or 3.99, in that we would have to test answer choices too ? Am I right ?
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 29 Mar 2013, 09:59
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emmak wrote:
If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x could be

A. 16/5
B. 17/5
C. 4
D. 30/7
E. 31/7


step 1

get all set members expressed in terms of a common denominator , i.e. 90

thus the set becomes (405/90 , 330/90 , 280/90 , 378/90 , 90x /90)

so 90x is the median of set (405,330,280,378)
reorder set (405 , 378,330,280) for 90x to be median of the set it has to be between 378 and 330

looking at number choices
d,e are excluded as 7 is no a factor of 90 , and then we are left with A,B,C

A - 16/5*90 = 288
B = 17/5*90 = 306
C = 90*4 = 360

Obviously then , C it is
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 15 Feb 2013, 18:20
Expert's post
emmak wrote:
If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x could be

16/5

17/5

4

30/7

31/7


The median is the middle number once all the numbers are arranged in increasing/decreasing order.
We see that
11/3 = 3.something,
28/9 = 3.something
21/5 = 4.something
9/2 = 4.something

So x should greater than the smallest two numbers and smaller than the greatest two numbers. We can see that x = 4 is possible. (First look at the simplest option or the middle option since options are usually arranged in increasing/decreasing order)
Answer (C)
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Expert Post
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Kudos [?]: 4841 [0], given: 163

Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 30 Mar 2013, 02:40
Expert's post
jainpiyushjain wrote:
VeritasPrepKarishma wrote:

The median is the middle number once all the numbers are arranged in increasing/decreasing order.
We see that
11/3 = 3.something,
28/9 = 3.something
21/5 = 4.something
9/2 = 4.something

So x should greater than the smallest two numbers and smaller than the greatest two numbers. We can see that x = 4 is possible. (First look at the simplest option or the middle option since options are usually arranged in increasing/decreasing order)
Answer (C)


The median could be some number such as 4.01 or 3.99, in that we would have to test answer choices too ? Am I right ?


Yes, x could be 3.99, 4.01 etc but x could be 4 too. The question says 'x could be', which means there are various possible values of x but only one value is given in the five options. Since we see that 4 is already there and x can certainly be 4, it means we don't need to test any other options because they cannot be the value of x. After all, PS questions have only one correct answer.
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 01 Apr 2013, 06:48
emmak wrote:
If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x could be

A. 16/5
B. 17/5
C. 4
D. 30/7
E. 31/7

9/2 = 4.5
11/3= 3.66
28/9 = 3.13
21/5 = 4.2

Since the set has 5 numbers the median has to be the middle value
Arranging the number in ascending order we get 3.13, 3.66, 4.2, 4.5. Now for x to be the median of the given set, x has to lie between 3.66 and 4.2.
Only one option satisfies the condition i.e x =4
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x [#permalink] New post 09 Jul 2014, 06:40
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Re: If x is the median of the set {9/2, 11/3, 28/9, 21/5, x}, x   [#permalink] 09 Jul 2014, 06:40
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