Because if it comes back negative, you should stay at home. If it comes back positive and you’re terrible at maths, it’s 50/50 as to whether you’re actually positive and you could still be carrying the virus and passing it to others, so you should stay at home.
Because if it comes back negative, you should stay at home. If it comes back positive and you’re terrible at maths, it’s 50/50 as to whether you’re actually positive and you could still be carrying the virus and passing it to others, so you should stay at home.