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VP
Joined: 22 Nov 2007
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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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CEO
Joined: 17 Nov 2007
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Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
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Bset 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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SVP
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B
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.
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