The formula for attack rate is # persons who suffered/total # people at risk times 10 to the n power... This is the formula my teacher gave us and this is what I see online, but what is 'n'? Can I just do x 100? What does it mean by the n power? I am trying to figure out some epidemiology questions and the formulas say 10 n power. What is n? Why are some tutors saying just x 100?