statistics

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In a recent survey in a Statistics class, it was determined that only 60% of the students
attend class on Thursday. From past data it was noted that 98% of those who went to class
on Thursday pass the course, while only 20% of those who did not go to class on Thursday
passed the course.
(a) What percentage of students is expected to pass the course?
(b) Given that a student passes the course, what is the probability that he/she attended classes
on Thursday.

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