Final answer:
The crude incidence rate per 100,000 members of the population is 13.
Step-by-step explanation:
To calculate the crude incidence rate, we need to determine the number of cases per 100,000 members of the population. In this case, the number of cases is given as 13 students. We can assume the population size is 100,000. Therefore, the crude incidence rate would be:
Crude Incidence Rate = (Number of Cases / Population Size) * 100,000
Plugging in the values:
Crude Incidence Rate = (13 / 100,000) * 100,000 = 13
Therefore, the crude incidence rate per 100,000 members of the population is 13. Rounded to the nearest whole number, it remains 13.