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Manager  Status: struggling with GMAT
Joined: 06 Dec 2012
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GMAT Date: 04-06-2013
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Set S consists of 5 values, not necessarily in ascending  [#permalink]

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15 00:00

Difficulty:   95% (hard)

Question Stats: 37% (02:09) correct 63% (01:46) wrong based on 223 sessions

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Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

(A) Zero
(B) One
(C) Two
(D) Three
(E) More than three

Originally posted by mun23 on 12 Dec 2012, 14:36.
Last edited by Bunuel on 13 Dec 2012, 02:14, edited 1 time in total.
Renamed the topic and edited the question.
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Re: Set S consists of 5 values, not necessarily  [#permalink]

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2
4
mun23 wrote:
Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?
(A)0
(B)1
(C)2
(D)3
(E)More than 3

Need details explanation.............

There could be 3 medians of this set.
8 , when x <8
x , when 8<=x<=12
and
12, when x>12

There could be 1 mean = (40+x)/5

Now, we can solve (40+x)/5 = 8 , x, 12 to find out values.. and if valid values are found that solution counts.
We get x= 0 ,10, 20. Hence 3 solutions.

Ans D it is.
##### General Discussion
Math Expert V
Joined: 02 Sep 2009
Posts: 60561
Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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1
1
mun23 wrote:
Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

(A) Zero
(B) One
(C) Two
(D) Three
(E) More than three

Similar questions to practice:
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if-the-range-of-the-set-containing-the-numbers-x-y-and-z-127089.html
the-sum-of-the-integers-in-list-s-is-the-same-as-the-sum-of-127755.html
given-the-ascending-set-of-positive-integers-a-b-c-d-e-115675.html

Hope it helps.
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Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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@vips and @bunuel:
Since mean and median are the same for evenly spaced sets, so to make the entire set an evenly spaced set x can be made either 0 or 20.
Can this concept be used to find x=10 as the mean and median?
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Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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Marcab wrote:
@vips and @bunuel:
Since mean and median are the same for evenly spaced sets, so to make the entire set an evenly spaced set x can be made either 0 or 20.
Can this concept be used to find x=10 as the mean and median?

Actually that (such numbers) could be a trap in this question.

You might remember -
If set is evenly spaced then for sure mean=median
But, if mean=median, it doesnt mean that set is evenly spaced. It may or may not be.

So, if we make x=0 and x=20, and find mean and median =10. We are pratically limiting our scope only to evenly spaced sets. And thus we get a few solutions-but not all.

We still need to look for solution for the other case where set is not evenly spaced. (Also x=10 doesnt give u an evenly spaced set.. so concept cant be applied directly, it would be more evident if the number of elements in set is even).

One easy concept that u can use though is, if median =mean then numbers in the set will be symmetrical around median. Why it helps is that finding median is usually very simple,without calculation.
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Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

(A) Zero
(B) One
(C) Two
(D) Three
(E) More than three

Mean = 8+x/5

x<=4
median =8

x >8 & x<12
median = X

8+x/5 =X
x=10

x>12
8+x/5 =12
x=20

So 3
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Set S consists of 5 values, not necessarily in ascending  [#permalink]

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mun23 wrote:
Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

(A) Zero
(B) One
(C) Two
(D) Three
(E) More than three

The mean is always equal to median when numbers in a set have equal deviation. For instance, in our case if deviation is 4, the x should 0 or 20.
Another case when a set is ascending from the mean out both sides. x should be 10. Please, look the atachments. Hope, it helps.

Attachments sets.jpg [ 74.27 KiB | Viewed 2787 times ]

VP  P
Joined: 07 Dec 2014
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Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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1
mun23 wrote:
Set S consists of 5 values, not necessarily in ascending order: {4, 8, 12, 16, x}. For how many values of x does the mean of set S equal the median of set S?

(A) Zero
(B) One
(C) Two
(D) Three
(E) More than three

if mean=(x+40)/5,
then x must be an even multiple of 5
let x=0: mean=8; median=8 yes
let x=10: mean=10; median=10 yes
let x=20; mean=12; median=12 yes
let x=30; mean=14; median=12 no
3 values of x work
D
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Set S consists of 5 values, not necessarily in ascending  [#permalink]

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1
First rearrange the given set in ascending order = {4,8, 12,16} {x}
average = (40 + x) / 5

now depending on value of x, the median will change, also
median can be one of 8, 12, x

(1) suppose median = x, then average = median
(40 + x)/5 = x => 4x = 40 => x = 10

(2) suppose median = 12, then average = 12
(40 + x)/5 = 12 => x = 20

(3) suppose median = 8, then average = 8
(40 + x)/5 = 8 => x = 0

so there are three possible values of x {0, 10, 20} for which median = mean => (D)
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Re: Set S consists of 5 values, not necessarily in ascending  [#permalink]

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_________________ Re: Set S consists of 5 values, not necessarily in ascending   [#permalink] 16 Jul 2019, 18:49
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