Spanish French German Total Boys 10 2 8 20 Girls 15 12 3 30 Total 25 14 11 50 4.3 a) If one person is randomly selected, what is the probability that they are a boy? 2050 BT one person is randomly selected, what is the probability that they are a boy or a girl? P(AB)-P(A)+P(B)-P(A and B) 20+30 so 350 f one person is randomly selected, what is the probability that they speak Spanish or speak French? PCAB)-PCA)+P(B)-P(Aard B) = d) If one person is randomly selected, what is the probability that they are a boy or speak Spanish? 20 So 25 So - lo So = 10 007 e) If one person is randomly selected, what is the probability that they are a girl or speak German? 4.4: 7. Conditional probability Hair color Black Blonde Brown Red Total 30 So TT 38 + ==== = =0.76 So So So 25 Boys Girls Total 4 5 9 4 6 10 10 8 18 2 1 3 20 20 40 Given one child is chosen, what is the probability of each? (a) They have blonde hair b) They have red or black hair 1%40 They have brown and red hair d) They have black hair, given that it is a boy e) They are a girl, given that they have brown hair 4/20 = 5=0.2 8/18 = 49 = 0.444 A