Ro is the reproduction number. It gives the average number of people who will catch a diseae from one person. Ro = C * P * D C = the number of contacts made by the infectious person per unit time (day, week, month, etc.) P = chance of transmission per contact with the infectious person D = the duration which an infected person remains infectious to others Hence, RO = 1000 x 0.0002 x 3 = 0.6 Solution Ro is the reproduction number. It gives the average number of people who will catch a diseae from one person. Ro = C * P * D C = the number of contacts made by the infectious person per unit time (day, week, month, etc.) P = chance of transmission per contact with the infectious person D = the duration which an infected person remains infectious to others Hence, RO = 1000 x 0.0002 x 3 = 0.6.