System Model
The probability of being infected by the common cold disease is determined by the age. The younger the age is, the person is more likely going to be infected. The older the age is, the person is less likely to be infected. However, depending on the distance between a healthy and infected person as well as the humidity level can change that case. The lower the humidity, the more likely the healthy person is to be infected. This particular story will be set in the common cold season, which are winter months. The winter has lower humidity levels, so the person is more likely going to be contaminated.