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12 Mar 2012, 11:05
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At Rocktown College, the 400 students taking Psychology 101 received an average score of 76 on the final exam, and the scores had a normal distribution. The bottom 16 percent of scorers will receive a failing grade. What is the score at or below which students fail the course?
(1) 8 students receive a score of 96 or higher.
(2) The standard deviation for the final exam was 10 points.
(1) 8 students receive a score of 96 or higher.
(2) The standard deviation for the final exam was 10 points.
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12 Mar 2012, 11:35
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iwillcrackgmat
At Rocktown College, the 400 students taking Psychology 101 received an average score of 76 on the final exam, and the scores had a normal distribution. The bottom 16 percent of scorers will receive a failing grade. What is the score at or below which students fail the course?
(1) 8 students receive a score of 96 or higher.
(2) The standard deviation for the final exam was 10 points.
(1) 8 students receive a score of 96 or higher.
(2) The standard deviation for the final exam was 10 points.
Ignore this question:
1. It's flawed;
2. The 68.2-95.4-99.7 rule of normal distribution you are supposed to use to solve this question is not tested on the GMAT.
Check this:
statistics-question-99222.html
the-members-of-a-recruiting-class-of-a-certain-military-99900.html
12 Mar 2012, 11:51
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Is it like this sort of questions will not appear in gmat at all ???
