Answer:
a) 0.48
b) 0.08
c) 0.44
Explanation:
The probabilty that husband and wife will be a live 30 years from now is 0.6 and 8.0.
If probability that husband will be alive 30 years from now is 0.6, then the probability that husband will not be alive 30 years from now is
1 - 0.6 = 0.4
If probability that wife will be alive 30 years from now is 0.8, then the probability that wife will not be alive 30 years from now is
1-0.8 = 0.2
a) probability that both will be a live will be
0.6 × 0.8 = 0.48
b) probability that nether will be alive
is
0.4 × 0.2=0.08
c) probability that at least one will be alive will be
Probability that husband would be alive and wife would die + probability that husband would die and wife would be alive
= 0.6×0.2 + 0.4 ×0.8
= 0.12+ 0.32 = 0.44