The following table shows the number of people infected or not infected by COVID-19, in a survey of 1,000 residents in various cities at the end of 2020.* Chicago Los Angeles N.Y. City Phoenix Totals Infected During Year 80 120 220 30 450 Not Infected 80 110 290 70 550 Total 160 230 510 100 1,000 * Based on actual percentages estimated to have been infected in those cities according to an online report by the Columbia University School of Public Health. (publichealth.columbia.edu) Express each of the following answers exactly, and not as an approximation. (a) What is the relative frequency that a NY City resident was infected? (b) What is the relative frequency that an infected person was in NY City? (c) What is the relative frequency that a resident in the survey was an infected person in NY City