If one paient was selected at random, what is the probability the patient is a female age less than 20?

Question

Patients Age < 20 20 ≤ Age < 40 40 ≤ Age < 60 Age ≥ 60

Male 64 33 53 68

Female 56 42 49 66

Answer 1

Patients	Age < 20	20 ≤ Age < 40	40 ≤ Age < 60	Age ≥ 60	Total
Male	64	33	53	68	218
Female	56	42	49	66	213
Probability of a patient being either a male or a female are independent events.					431
Probability of a patient being a Male = 218/431	0.506
Probability of a patient being a Female = 213/431 = p1	0.494
Probability of a patient being a Female age<20 = 56/213 = p2	0.263
Probability of a patient being Female & age<20 = p1*p2	0.130