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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
Posts: 5244
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Of the students at a certain school, 30% of the students are [#permalink]  07 Oct 2005, 08:11
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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%
Manager
Joined: 06 Oct 2005
Posts: 89
Location: Beantown
Followers: 1

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80% of 30% = 24%
70% of 30% = 41%
90% of 40% = 36%

I'd pick (D)

B.
Manager
Joined: 04 Oct 2005
Posts: 246
Followers: 1

Kudos [?]: 21 [0], given: 0

clearly explained, agreed
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