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Set S consists of 5 values, not necessarily in ascending

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

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New post 12 Dec 2012, 13:36
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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
[Reveal] Spoiler: OA

Last edited by Bunuel on 13 Dec 2012, 01:14, 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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New post 12 Dec 2012, 23:15
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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)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.
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Re: Set S consists of 5 values, not necessarily in ascending [#permalink]

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New post 13 Dec 2012, 01:21
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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


Similar questions to practice:
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what-is-the-value-of-n-in-the-list-above-137225.html
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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New post 14 Dec 2012, 01:12
@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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New post 14 Dec 2012, 01:22
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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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New post 23 Aug 2016, 03:13
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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New post 24 Nov 2017, 10:26
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.

The answer is D
Attachments

sets.jpg
sets.jpg [ 74.27 KiB | Viewed 385 times ]

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

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New post 24 Nov 2017, 19:19
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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


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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Re: Set S consists of 5 values, not necessarily in ascending   [#permalink] 24 Nov 2017, 19:19
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