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12 Apr 2025, 23:03
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This is an excerpt from the chapter "Weaken the Conclusion" in our book "EducationAisle Critical Reasoning Nirvana":
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Patterns in "Weaken the Conclusion"
Trick with Quant concepts
We continue with this theme in this quiz, since this is a very common pattern on Weaken the Conclusion. Simple Quant concepts such as percentages, averages, ratios, and proportion play a very key role throughout Critical Reasoning. In fact, these concepts are not just limited to Weaken the Conclusion questions.
Let us see how skilled you are at applying these simple Quant concepts, to the question below:
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Question:
The average GMAT score of the twenty students enrolled at “Majestic GMAT Classes” is 645, a score which represents approximately the 90th percentile. Clearly, the classes are very effective for students.
What, if true, weakens the argument?
GMAT-Club-Forum-huugnx5u.png [ 66.24 KiB | Viewed 169 times ]
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Patterns in "Weaken the Conclusion"
Trick with Quant concepts
We continue with this theme in this quiz, since this is a very common pattern on Weaken the Conclusion. Simple Quant concepts such as percentages, averages, ratios, and proportion play a very key role throughout Critical Reasoning. In fact, these concepts are not just limited to Weaken the Conclusion questions.
Let us see how skilled you are at applying these simple Quant concepts, to the question below:
--------------------------------------------------------------------------------------------------------------------
Question:
The average GMAT score of the twenty students enrolled at “Majestic GMAT Classes” is 645, a score which represents approximately the 90th percentile. Clearly, the classes are very effective for students.
What, if true, weakens the argument?
Attachment:
GMAT-Club-Forum-huugnx5u.png [ 66.24 KiB | Viewed 169 times ]
16 Apr 2025, 00:37
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Solution
A few students in the class got an exceedingly high GMAT score.
Let us think about it. The above correct answer suggests a scenario such as the following:
Notice that out of the twenty students enrolled at “Majestic GMAT Classes”, six students got an exceedingly high GMAT score (of 765), while the majority (fourteen) managed a very modest score of 595. Hence, the average GMAT score of these twenty students is 645, as calculated below:
Now it should be evident that while the average GMAT score of the class is quite high (at 645), the distribution of the scores (as shown in the table above) does not suggest that the classes are very effective for students, since majority of students (70% of students) managed a very moderate score of 595. Hence the correct answer weakens the conclusion that classes are very effective, because for a majority of students (fourteen), the classes are clearly not effective.
p.s This is a similar official question, for addition practice.
GMAT-Club-Forum-vnixs3el.png [ 22.33 KiB | Viewed 99 times ]
GMAT-Club-Forum-y1oxodc1.png [ 21.96 KiB | Viewed 99 times ]
A few students in the class got an exceedingly high GMAT score.
Let us think about it. The above correct answer suggests a scenario such as the following:
Notice that out of the twenty students enrolled at “Majestic GMAT Classes”, six students got an exceedingly high GMAT score (of 765), while the majority (fourteen) managed a very modest score of 595. Hence, the average GMAT score of these twenty students is 645, as calculated below:
Now it should be evident that while the average GMAT score of the class is quite high (at 645), the distribution of the scores (as shown in the table above) does not suggest that the classes are very effective for students, since majority of students (70% of students) managed a very moderate score of 595. Hence the correct answer weakens the conclusion that classes are very effective, because for a majority of students (fourteen), the classes are clearly not effective.
p.s This is a similar official question, for addition practice.
Attachment:
GMAT-Club-Forum-vnixs3el.png [ 22.33 KiB | Viewed 99 times ]
Attachment:
GMAT-Club-Forum-y1oxodc1.png [ 21.96 KiB | Viewed 99 times ]
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