5 Consider a class with 100 enrolled students None of the students were ill at the beginning of the school year On September 30 a total of five students reported having norovirus All continued to be ill on October 1 but all five recovered within 3 days On October 14 another three students developed gastroenteritis All of the students continued to be ill on October 15 but all three recovered five days later In this example assume that a person cannot get norovirus more than once a Calculate the prevalence of norovirus in the class on October 1 b Calculate the prevalence of norovirus in the class on October 30 c Calculate the cumulative incidence of norovirus in the class during the month of October