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M30-04

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M30-04  [#permalink]

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New post 16 Sep 2014, 01:45
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A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

44% (00:56) correct 56% (01:02) wrong based on 178 sessions

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Re M30-04  [#permalink]

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New post 16 Sep 2014, 01:45
2
2
Official Solution:


What is the median of data set A?

(1) No number in data set A is less than the average (arithmetic mean) of the set.

Since no number is less than the average, then no number is more than the average, which implies that the list contains identical elements: A={x, x, x, ...}. From this it follows that (the average)=(the median). But we don't know the value of \(x\), thus this statement is NOT sufficient.

(2) The average (arithmetic mean) of data set A is equal to the range of the set.

Not sufficient: if A={0, 0, 0, 0}, then (the median)=0, but if A={1, 2, 2, 3}, then (the median)=2.

(1)+(2) From (1) we have that the list contains identical elements. The range of all such sets is 0. Therefore, from (2) we have that (the average)=(the range)=0 and since from (1) we also know that (the average)=(the median), then (the median)=0. Sufficient.


Answer: C
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Re: M30-04  [#permalink]

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New post 22 Oct 2016, 16:11
Shouldn't the mention of Set A in (2) be Set S instead?
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New post 23 Oct 2016, 00:37
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Re: M30-04  [#permalink]

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New post 14 Jan 2018, 09:01
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Bunuel
M28-47 and M30-04 are the same question
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New post 14 Jan 2018, 23:00
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Re: M30-04  [#permalink]

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New post 01 Jan 2019, 07:23
Can't the Data Set A (using Both the statements) be {1} , {2,2} or {3,3,3} etc ?
median can be 1,2 or 3 too.

Could you please explain why the above numbers can't be Data Set A.
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Re: M30-04  [#permalink]

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New post 01 Jan 2019, 10:06
{2,2} or {3,3,3} does not satisfy statement 2.
In the above mentioned set Average is not equal to Range
For , {2,2} Average = 2, Range = 0
{3,3,3}, Average = 3, range =0
Only set A= { x, x,x,x...} where x=0 satisfies both the statement, hence ans C.
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Re: M30-04  [#permalink]

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New post 08 Jan 2019, 08:05
Hi Bunuel
Can you please explain why we consider {0,0,0,0} & {1,2,2,3} for Set A? Is repetition of elements allowed in Sets?
How a Set is different from a List?
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New post 09 Jan 2019, 00:49
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Re: M30-04   [#permalink] 09 Jan 2019, 00:49
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