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Is 5 the median of Set X? (1) Set X has . . . . .

Expert replies
by VJesus12 » Thu Jan 18, 2018 4:03 am
Is 5 the median of Set X?

(1) Set X has 6 elements, which are odd positive integers.
(2) The smallest member of Set X is 1.

The OA is the option E.

Is it not sufficient to use both statements together to get an answer? Why not? Experts, I ask for your help.
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Source: — Data Sufficiency |

by Brent@GMATPrepNow » Thu Jan 18, 2018 6:19 am
VJesus12 wrote:Is 5 the median of Set X?

(1) Set X has 6 elements, which are odd positive integers.
(2) The smallest member of Set X is 1.
Target question: Is 5 the median of Set X?

Statement 1: Set X has 6 elements, which are odd positive integers.
There are several sets that satisfy statement 1. Here are two:
Case a: Set X = {1, 5, 5, 5, 5, 9} . In this case, 5 IS the median of set X
Case b: Set X = {1, 7, 7, 7, 7, 9} . In this case, 5 is NOT the median of set X
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: The smallest member of Set X is 1
Obviously statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined
There are several possible sets that satisfy BOTH statements. Here are two:
Case a: Set X = {1, 5, 5, 5, 5, 9} . In this case, 5 IS the median of set X
Case b: Set X = {1, 7, 7, 7, 7, 9} . In this case, 5 is NOT the median of set X
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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