For customers purchasing a refrigerator at a certain appliance store, let a be the event that the refrigerator was manufactured in the u. s., b be the event that the refrigerator had an icemaker, and c be the event that the customer purchased an extended warranty. relevant probabilities are below.
p(a) = 0.80 p(b | a) = 0.94 p(b | a' ) = 0.79
p(c | a ∩ b) = 0.76 p(c | a ∩ b' ) = 0.56
p(c | a' ∩ b) = 0.68 p(c | a' ∩ b' ) = 0.33

(c) compute p(b ∩