For the right tail, is it appropriate to just calculate a mean and standard deviation, add 1, 2 & 3 standard deviations from the mean to create a range then compare that to the normal 68/95/99.7 for the standard normal distribution after using the norm.dist function in excel to test each standard deviation value.
The contagious period for a cold lasts about three to four days into the illness. As a general rule, people with a cold are most contagious about three days after their initial exposure to the virus. For more information on colds, influenza and related topics, check out the links on the next page.
Most of the time you become contagious about One to three days after contracting the flu and stay contagious for up to 5 days after onset of symptoms. However, children and adults with weakened immune symptoms can be contagious to those around them up to 14 days. For colds, most people are contagious for a day before symptoms appear and remain contagious for up to 5-7 days. In rare cases, children can pass a cold for up 14 days. A cold is also known as an upper respiratory infection.