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27 Aug 2010, 09:10
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
18% (02:29) correct
82%
(01:37)
wrong
based on 17
sessions
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Not Attempted Yet
The members of a recruiting class of a certain military outfit are taking thier physical test, and those who score in thebottom 16 percent will have to retake the test. If the scores are normally distributed and have a mean of 72 , what is the score at or below which the recruits will have to retest.
1 there are 500 recruits in the class
2 10 recruits scored 82 or higher
A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.
i dont get this Q can some one explain this to me in plain english !
thanks
1 there are 500 recruits in the class
2 10 recruits scored 82 or higher
A) Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B) Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C) BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D) EACH statement ALONE is sufficient.
E) Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.
i dont get this Q can some one explain this to me in plain english !
thanks
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27 Aug 2010, 10:52
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rxs0005
First of all, as I know, normal distribution is not tested on GMAT.
Next, even if it were tested, the question still would be flawed as the normal distribution is an absolutely continuous probability distribution and I don't think that we can apply its three-sigma rule (68.2-95.4-99.7 rule), as intended, to solve this question which is not continuous distribution.
So I wouldn't worry at all about this question.
Hope it helps.
11 Dec 2010, 19:33
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Good to hear this won't be on the GMAT.
