LSAT 141 – Section 2 – Question 21

LSAT 141 - Section 2 - Question 21

September 2014

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Question
QuickView		 Type Tags Answer
Choices		 Curve Question
Difficulty		 Psg/Game/S
Difficulty		 Explanation
PT141 S2 Q21
+LR
Inference +Inf
Conditional Reasoning +CondR
Quantifier +Quant
A
13%
159
B
11%
157
C
31%
162
D
8%
158
E
37%
167
160
168
175
 +Hardest 146.882 +SubsectionMedium

Most of the students who took Spanish 101 at the university last semester attended every class session. However, each student who received a grade lower than B minus missed at least one class session.

Summary
Over half of the students who took Spanish 101 last semester attended 100% of the class sessions.
Everyone who got lower than a B minus (in other words, C+ or lower) did NOT attend 100% of the class sessions.

Very Strongly Supported Conclusions
First, take the contrapositive of the second statement:
Everyone who DID attend 100% of the class sessions did NOT get lower than a B minus (in other words, they got a B minus or higher).
Combine the first statement with the contrapositive of the second statement:
Over half of students who took Spanish 101 last semester did NOT get lower than a B minus (in other words, they got a B minus or higher).

A
At least some of the students who received a grade of A minus or higher attended every class session.
We don’t know anything about everyone who got a grade of A minus or higher. We know about everyone who got a grade lower than B minus; but this doesn’t tell us anything about people who got a grade of A minus or higher.
B
Most, if not all, of the students who missed at least one class session received a grade lower than B minus.
This reverses the second statement. We know everyone who got a grade lower than B minus missed at least one class session. This doesn’t imply that most people who missed at least one class session got a grade lower than B minus. “All X are Y” does not imply “Most Y are X.”
C
Most of the students received a grade higher than B minus.
Although we know that most of the students did not get a grade lower than B minus, this doesn’t imply that they got a grade HIGHER than a B minus. They could have all received B minuses.
D
At least one student who received a grade of B minus or higher missed one or more class sessions.
We know that all students who got a grade lower than a B minus missed at least one class session. This doesn’t imply that some students who got a B minus or higher missed a class session. Maybe the ones who got a B minus or higher attended every class.
E
More than half of the students received a grade of B minus or higher.
Must be true based on the first statement and the contrapositive of the second statement. Over half of the students attended every class session. Everyone who attended every class session did NOT get a grade lower than a B minus (in other words, B minus or higher).

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LSAT PrepTest 141 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Reading Comprehension

Section 4 - Logical Reasoning

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