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# Of the students at a certain school, 30% of the students are

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Current Student
Joined: 29 Jan 2005
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Of the students at a certain school, 30% of the students are [#permalink]

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07 Oct 2005, 09:11
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Of the students at a certain school, 30% of the students are in class A, 30% of the students are in class B, and 40% of the students are in class C. Of the students in class A, 80% have a passing grade. Of the students in class B, 70% have a passing grade. Of the students in class C, 90% are making a passing grade. If a student is selected at random, what is the probability that the student has a passing grade?

A. 93%
B. 75%
C. 36%
D. 81%
E. 72%
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Joined: 06 Oct 2005
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07 Oct 2005, 09:18
80% of 30% = 24%
70% of 30% = 41%
90% of 40% = 36%

I'd pick (D)

B.
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07 Oct 2005, 09:26
clearly explained, agreed
07 Oct 2005, 09:26
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