SOLUTION: The probability that joy joins campus is 1/3.if she joins campus,the probability that she does statistics is 3/5,an if she doesn't join campus the probability that she does statist

Question 1085325: The probability that joy joins campus is 1/3.if she joins campus,the probability that she does statistics is 3/5,an if she doesn't join campus the probability that she does statistics is 1/7.
a)find the probability that joy does statistics in campus
b)find probability that she does statistics
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Statistics on campus is (1/3)(3/5)=(1/5)
Probability she does statistics at all is that (1/5)+probability she does it not on campus
that is (2/3)(1/7)=(2/21)
The probability she does statistics is (1/5)+(2/21)=(21+10)/105 =31/105
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