Question 1174529
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Studying and not studying are complementary events, so P(study)=3/10 means P(not study)=7/10.  Then<br>
P(study and pass) = (3/10)(9/10) = 27/100
P(not study and pass) = (7/10)(2/10) = 14/100<br>
P(pass) = 27/100+14/100 = 41/100<br>
P(pass|study) = (27/100)/(41/100) = 27/41<br>