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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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Video solution from Quant Reasoning starts at 0:30
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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getzgetzu wrote:
x, 3, 1, 12, 8

If x is an integer, is the median of 5 numbers shown greater than the average of 5 numbers?

1) x>6
2) x is greater than median of 5 numbers


(1) insuff.
for instance x can be 7 so median is 7 itself and mean around 5 so mean < median, but x can be 1000 in that case median is 8 but mean is way larger so is not enough

(2) that means that x>8 same problem as statement (1)

together nothing

so I would go with E in this one
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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getzgetzu wrote:
x, 3, 1, 12, 8

If x is an integer, is the median of 5 numbers shown greater than the average of 5 numbers?

1) x>6
2) x is greater than median of 5 numbers


I go for E.

1) x>6, so x could be lets say 9, then median is 8, and the avg is 6.6, however if x is lets say 100, the mean is greater then median, so not suff.

2) similarly since x is greater then the median, 8 is the median, from there its similar to 1). not suff

therefore, E is correct.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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1,3,8,12 and Now we need to plug in X

1) x>6...7 to inf
X mean med
7 31/5 7
8 32/5 8
9 33/5 8
100 124/5 8

In suffi

2) x is greater than med

1,3,8,x,12
or
1,3,8,12,x

Again pluging number insufficient

Togather no furthere info

hence E
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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LM wrote:
x,3,1,12,8

If x is an integer, is the median of the 5 numbers shown greater than the average (arithmetic mean ) of the 5 numbers ?

(1) X > 6

(2) X is greater than the median of the 5 numbes.


Got E.

(1) plug in x = 7, the lowest avg value is (7+3+1+12+8) / 5 = 31/5 =~ 6
This is lower than the median, which is 7 in this case. However, if x is really large, the avg will shoot through the roof, but the median will remain at 8. INSUFFICIENT.

(2) This tells us that x>8, so plug in x=9. We get (9+3+1+12+8) / 5 = 33/5 =~ 6.6. This still less than 8 ,which is the median. Same reason as above, INSUFFICIENT.

Together, we get x>8, INSUFFICIENT.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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we can arrange this question like this
1,3,x,8,12 or 1,3,8,x,12 or 1,3,8,12,x
so st 1 (24+x)/5< x,or 8 or 12 it give three different solution i.e 6<x,x<16,x<36 so seems to not sff

st 2 xis greater > median by arrange he series we get 1 3 8 x 12 or 1 3 8 12 x where 8 is median so
24+x<8 ====>x <16 so foe any value of x it gives different result.

and combining 1 n 2 x>6 and x<16 take any value so
it seems to me asn sd be E

if any err let me know plz....
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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x,3,1,12,8

If x is an integer, is the median of the 5 numbers shown greater than the average (arithmetic mean ) of the 5 numbers ?

(1) x > 6

(2) x is greater than the median of the 5 numbers.

In the original condition, there is 1 variable(x), which should match with the number of equation. So you need 1 more equation. For 1), 1 equation, for 2) 1 equation, which is likely to make D the answer. In 1) & 2),
for 1), when x>0, 1,3,x,8,12/1,3,8,x,12/1,3,8,12,x. mean=(1+3+8+12+x)/5=(24+x)/5 and median=x,8. So, (24+x)/5>x? or (24+x)/5>8? is unknown, which is not sufficient.
For 2), in the above, median is 3, x, 8 and from x>3, x>x(impossible), x>8, it is x>8>3. So, although x>8, (24+x)/5>8?, which is x>16?, is not sufficient. Even if 1) & 2), when x>8, you cannot find out (24+x)/5>8?, x>16? from x>8>6>3. Therefore it is not sufficient and the answer is E.


-> For cases where we need 1 more equation, such as original conditions with “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations”, we have 1 equation each in both 1) and 2). Therefore, there is 59 % chance that D is the answer, while A or B has 38% chance and C or E has 3% chance. Since D is most likely to be the answer using 1) and 2) separately according to DS definition. Obviously there may be cases where the answer is A, B, C or E.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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Mean has a greater flexibility in terms of how big it can get. So for the median to be greater than the mean we need to limit the upward movement of the mean by restricting the value of x. Thus we need a constraint such as x<(certain number) and since neither of the choices does so answer is E.

For instance, even if we were given x>0
then say x=1 {1 1 3 8 12} 3>25/5? NO
now say x=8 {1 3 7 8 12} 8>(24+8)/5? Yes

on the other hand, say if we were given x<6, the answer would be a definitive No

would you pls confirm if that logic looks good, Bunuel?
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
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Bunuel wrote:
metallicafan wrote:
\(x, 3, 1, 12, 8\)

If x is an integer, is the median of the 5 numbers shown greater than the average (arithmetic mean) of the 5 numbers?

(1) \(x>6\)
(2) x is greater than the median of the 5 numbers


We have a set: {1, 3, 8, 12, x} Question: is \(median>mean=\frac{x+1+3+8+12}{5}=\frac{x+24}{5}\)? Note that as we have odd (5) # of terms in the set then the median will be the middle term when arranged in ascending (or descending) order. So:
if \(x\leq{3}\): {1, x, 3, 8, 12} then \(median=3\);
if \(3<x\leq{8}\): {1, 3, x, 8, 12} then \(median=x\);
if \(x\geq{8}\): {1, 3, 8, x, 12} then \(median=8\).

(1) \(x>6\). If \(x=7\) then the median will be 7 as well: {1, 3, 7, 8, 12} and mean will be \(mean=\frac{7+24}{5}=6.2\), so \(median=7>mean=6.2\) and the answer is YES BUT if \(x\) is very large number then the median will be 8: {1, 3, 8, 12, x=very large number} and mean will be more than median (for example if \(x=26\) then \(mean=\frac{26+24}{5}=10\), so \(median=8<10=mean\)) and the answer will be NO. Not sufficient.

(2) x is greater than the median of the 5 numbers --> so \(median=8\): now, if \(x=11\) then \(mean=\frac{11+24}{5}=7\), so \(median=8>7=mean\) and the answer is YES. Again it's easy to get answer NO with very large \(x\). Not sufficient.

(1)+(2) Again, x=11 and x=very large number give two diffrent answers to the question. Not sufficeint.

Answer: E.


1)
Case 1: 6 < x < 8
x > (24+x)/5?
5x > 24 + x?
x > 6? => Yes

Case 2: x >= 8
8 > (24+x)/5?
40 > 24 + x?
16 > x? => Don't know => Not sufficient
If 16 > x, then yes.
If 16 <= x, then no.

Not Sufficient

2) x > 8
8 > (24+x)/5?
40 > 24+x?
16 > x? => Don't know => Not sufficient

1+2
x >= 8
8 > (24+x)/5?
40 > 24 + x?
16 > x? => Don't know => Not sufficient
If 16 > x, then yes.
If 16 <= x, then no.

ANSWER: E
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
Hi Bunuel! Can you please send me some links to questions similar to this one? Many tks! :)

Bunuel wrote:
metallicafan wrote:
\(x, 3, 1, 12, 8\)

If x is an integer, is the median of the 5 numbers shown greater than the average (arithmetic mean) of the 5 numbers?

(1) \(x>6\)
(2) x is greater than the median of the 5 numbers


We have a set: {1, 3, 8, 12, x} Question: is \(median>mean=\frac{x+1+3+8+12}{5}=\frac{x+24}{5}\)? Note that as we have odd (5) # of terms in the set then the median will be the middle term when arranged in ascending (or descending) order. So:
if \(x\leq{3}\): {1, x, 3, 8, 12} then \(median=3\);
if \(3<x\leq{8}\): {1, 3, x, 8, 12} then \(median=x\);
if \(x\geq{8}\): {1, 3, 8, x, 12} then \(median=8\).

(1) \(x>6\). If \(x=7\) then the median will be 7 as well: {1, 3, 7, 8, 12} and mean will be \(mean=\frac{7+24}{5}=6.2\), so \(median=7>mean=6.2\) and the answer is YES BUT if \(x\) is very large number then the median will be 8: {1, 3, 8, 12, x=very large number} and mean will be more than median (for example if \(x=26\) then \(mean=\frac{26+24}{5}=10\), so \(median=8<10=mean\)) and the answer will be NO. Not sufficient.

(2) x is greater than the median of the 5 numbers --> so \(median=8\): now, if \(x=11\) then \(mean=\frac{11+24}{5}=7\), so \(median=8>7=mean\) and the answer is YES. Again it's easy to get answer NO with very large \(x\). Not sufficient.

(1)+(2) Again, x=11 and x=very large number give two diffrent answers to the question. Not sufficeint.

Answer: E.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
Bunuel, how to approach for these kind of hard stats questions. I always falter here.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
The key here is to realize that if we have an unknown variable, the mean can be infinite. We don't have to test values to ensure the mean > median.

We have to test values to ensure the median > mean.

Let's say x = 9 (this number works for both statement 1 and 2)

9 + 24 = 33 / 5 = 6.6

Is 8 (median) > 6.6? Yes.

Since we can get a yes and a no answer, the answer is E.
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Re: If x is an integer, is the median of 5 numbers shown greater than the [#permalink]
Hi, the median can be 3, x and 8, right? Can someone tell me why statement 2 implies that x>8?
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