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Given a set {x, y, z}, if the first term in the data set

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Re: DS - Stat [#permalink] New post 26 Jun 2011, 10:28
first of all i also thought the answer should be D but i chose B finally...
the question said the first number is 3
statement 1 says that the range= highest-lowest
there would be 2 cases: every number in the set is 3 3 3 or the highest number is 3 and the second and the third are both 0
becuase the question doesnt say that the numbers in the set must be in order, we cant conclude anything about this statement.
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Re: DS - Stat [#permalink] New post 26 Jun 2011, 10:37
v1rok wrote:
Given a set {x, y, z}, if the first term in the data set above is 3, what is the third term?

(1) the range of this data set is 0

(2) the standard deviation of this data set is 0


Doesn't matter 1st, 2nd or nth term is 3.

If one of the elements is "3" and the range of the set is 0; then all elements must be 3 irrespective of the order you write those elements.

Range 0- All elements identical.

Std Dev 0- All elements identical.

Ans: "D"
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Re: DS - Stat [#permalink] New post 27 Jun 2011, 10:03
v1rok wrote:
Given a set {x, y, z}, if the first term in the data set above is 3, what is the third term?

(1) the range of this data set is 0

(2) the standard deviation of this data set is 0


From both the statement same thing can be concluded that each element is equal to 3 only

hence D is the answer :-D :-D
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Re: DS - Stat   [#permalink] 27 Jun 2011, 10:03
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