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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?