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M20 Q35

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Manager
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Joined: 15 Sep 2011
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Concentration: Finance, International Business
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Re: M20 Q35 [#permalink] New post 08 May 2013, 14:59
Quote:
Note that the median of a set with odd number of elements is just the middle element, when arranged in ascending/descending order.

(1) The median of set is 0. The median of this set of 5 (odd) elements must be the middle term, hence . Sufficient.

(2) The median of set is . It could be that (in this case the set is {-1, 0, 0, 1, 3}) as well as it could be that (in this case the set is {-2, -1, 1, 2, 3}). Not sufficient.

Answer: A.


Very clear, Thanks all.

I'm pretty slow with picking numbers for DS problems, especially statistics. In this case, is "2" a go to number for testing, or does this 'recognition' skill come with practice and/or knowledge?
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Re: M20 Q35 [#permalink] New post 09 May 2013, 01:22
Expert's post
mejia401 wrote:
Quote:
Note that the median of a set with odd number of elements is just the middle element, when arranged in ascending/descending order.

(1) The median of set is 0. The median of this set of 5 (odd) elements must be the middle term, hence . Sufficient.

(2) The median of set is . It could be that (in this case the set is {-1, 0, 0, 1, 3}) as well as it could be that (in this case the set is {-2, -1, 1, 2, 3}). Not sufficient.

Answer: A.


Very clear, Thanks all.

I'm pretty slow with picking numbers for DS problems, especially statistics. In this case, is "2" a go to number for testing, or does this 'recognition' skill come with practice and/or knowledge?


In this case I used trial and error approach but generally smart numbers recognition skills come with practice.
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Re: M20 Q35   [#permalink] 09 May 2013, 01:22
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