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Question

Giving a test to a group of students, the grades and gender are summarized below

A	B	C	Total
Male	15	17	8	40
Female	16	5	3	24
Total	31	22	11	64

If one student is chosen at random,

Find the probability that the student was female AND got a "B".

Answer 1

I assume the column headings are displaced to the left. In which case, female with a B is 5 cases. The total number of cases is 64.

Therefore, the probability of picking a student who is F and has a "B" grade is 5/24

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