7. The following table gives information about a population of smokers and of those
having lung diseases due to smoking.
20-40 years
40-60 years
60-80 years
Total
(B)
(C)
(D)
(E)
4000
160
13500
265
An individual is selected at random from this population. The probability that this
individual is sick knowing that he/she is between 60 and 80 years old is
(A)
265
13500
Smokers
2500
3000
2000
Men
265
4000
Sick
30
50
rahim
seh
Sick
50
75