In an old folk home of total size 6, initially two people are suffering from a disease which is incurable, but not serious: the other four are susceptible. Infective are not isolated. The infective contact rate is = 0.5 per day. Find the expected waiting time until the whole old folk home has the disease. (Correct to two decimal places). Solution (i)The waiting time until the whole old folk home has the disease is: 1/beta =1/0.5 =2.