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Difficulty:
95%
(hard)
Question Stats:
18%
(02:29)
correct 82%
(01:37)
wrong
based on 17
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History
Date
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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
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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
i dont get this Q can some one explain this to me in plain english !
thanks
Show more
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.
A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.