Question

Probability of a man to live for next 25 years is 4/5 and so, his wife is 3/4, Find the probabilities that 

(i) both live for 25 years 

(ii) at least one of them live for 25 years 

(iii) Only wife live for 25 years.

Answer 1

Let A : Event that man live for next 25 years and 

B : event that wife live for next 25 years. 

Clearly both are independent events

(i) Probability that both live for 25 years

(ii) Probability that at least one of them live for 25 years

(iii) Probability that only wife lives for 25 years