Question 577857
I'll do the first one to get you started.


a)


P(A|B) = P(A and B)/P(B)


0.3 = P(A and B)/0.5


0.15 = P(A and B)


P(A and B) = 0.15


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b)

I'll let you try this one. Use the formula


P(A or B) = P(A) + P(B) - P(A and B)


to find the answer.