Answers to Thursday's work

Ch. 15 #4:
a) 0.14
b) 0.23
c) 0.77

Ch. 15 #20
a) P(Canada | Mexico) = 0.04/0.09 = 0.444

b) No, 4% have been to both

c) No, P(Canada) = 18%, which does not equal part (a), above, so not
independent.