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ds range

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VP
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ds range [#permalink] New post 07 Feb 2008, 11:46
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If 2 elements are dropped from set x (-10,-8,0,6,7), what will be the percentage change in its mean?

1. the median of the set will remain the same

2. the range of the set will decrease by 3
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Re: ds range [#permalink] New post 07 Feb 2008, 11:51
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set x (-10,-8,0,6,7)

1. Subtraction of -10,7 and -8,7 will lead to different mean.
insuff.

2. Only -10,7 is possible.
suff.
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Re: ds range [#permalink] New post 07 Feb 2008, 15:33
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from stat 1, all you know is that either -10 and 7 can be dropped, or -8 and 6 can be dropped. each of these cases leads to a different answer. insuff.

from stat 2, the only possibility of the terms that are dropped is -10 and 7. original range is 7-(-10)=17, and so new range will be 17-3=14, so -8 and 6 must stay. you know the new set, and can find the new average, and thus the percentage change.
Re: ds range   [#permalink] 07 Feb 2008, 15:33
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