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

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Of the students at a certain school, 30% of the students are [#permalink] New post 07 Oct 2005, 08:11
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E

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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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 [#permalink] New post 07 Oct 2005, 08:18
80% of 30% = 24%
70% of 30% = 41%
90% of 40% = 36%

Total 81% have passing grade.

I'd pick (D)

B.
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 [#permalink] New post 07 Oct 2005, 08:26
clearly explained, agreed ;)
  [#permalink] 07 Oct 2005, 08:26
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Of the students at a certain school, 30% of the students are

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