Mathematics & Statistics
Undergraduate
假設某校女性有45%，已知男性中有45%的人是吸煙者，女性則為25%今由此校隨機選出一學生，試問：（a)此學生吸菸的機率為何？
（b)若確定此學生為吸菸者，則此人是女性機率為何？
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