Suppose the probability of contracting a certain disease is p = 0.0004 for a new case in a given year.What is the expected number of new cases in a year in a town where 4000 people do not currently have the disease?
A)0.16
B)1.6
C)16
D)0.0004
E)0.10

Question

Quizplus · Accepted Answer

The expected number of new cases can be found by multiplying the probability of contracting the disease by the number of people who do not currently have it.

Expected number of new cases = p * (number of people without the disease)
Expected number of new cases = 0.0004 * 4000
Expected number of new cases = 1.6

Therefore, the expected number of new cases in a year in the given town is 1.6, which is answer choice B.

Suppose the Probability of Contracting a Certain Disease Is P