Question 4 (Total 20 marks) The recent Hong Kong Universal Community Testing Programme (UCTP) aimed to better gauge the COVID-19 infection situation in Hong Kong was conducted during September 1 to 14, 2020 2019 2 Universal Community Testing There are three main processes involved in the testing. 1. A participant firstly enters the testing centre and takes a body-temperature measurement and then cleans hands with alcohol disinfectant gel. 2. Then there needs a registration of those having pre-appointment booking as well as some occasional walk-in citizens. 3. Finally the actual testing to collect the sample at the nose and throat through a combined nasal and throat swab. The processing times for the various processes described above are: 1.0.25 min for temperature measuring and hand cleaning 2. 1 min each for registration of those having pre-appointment, and 5 minutes for those walk-in participants 3. 4 minutes for the nasal and throat sample taking At a particular testing centre in Tin Shui Wai on the first day, i.e. Sep 1, all participants had pre- appointment. There was one temperature measuring station, two registration booths, and ten teams of sample collecting specialists. The participant arrival rate was 120 persons per hour. A1. Draw the flow chart labelled with key processing rates and the no. of serving units