The standard test for COVID-19 is the PCR test. It is estimated that it can have a false negative rate of around 15%, meaning that when a person who has COVID-19 takes the test, 15% of the time the test will indicate that they don't. The test almost never indicates the presence of COVID-19 when a person doesn't have the disease; assume that this happens only 1% of the time. In early September it was estimated that among a random sample of 100,000 people in Canada approximately 50 have COVID-19 at any given time. If organizers of an event will require everyone to show a negative test before attending, how many people can there be at the event and still keep the probability of there being at least one infected person below 1%? What if you wanted to keep probability of at least one person being infected below .1%?