On the basis of the health records of a particular group of people, an insurance company

accepted 60% of the group for a 10 year life policy. Ten years later it examined the survival

rates for the whole group and found that 80% of those accepted for the policy had survived

the 10 years, while 50% of those rejected had survived the 10 years. What percentage of

the group did not survive 10 years? If a person did survive 10 years, what is the probability

that they had been refused cover?

Please help me understand...people. Probability is the only weakest topic of maths..!