Sex Age Length of illness

Male 20 20 – 40 10 < 6 months 15 Female 30 40 - 60 10 6 - 12 months 15 60 - 80 30 12 - 36 months 10 > 36 months 10

U randomly selected one card. what is the probability that:

a. It is a female card?

b. It belongs to a patient whose lenght of illness has been 12 -36 months?

c. it belongs to a patient whose age interval is either 20 – 40 or 60 – 80?