Question

A 150-unit apartment complex is infested with rats. The apartment caretaker checked 9 units and found the following number of rats {2, 5, 3, 1, 0, 3, 7, 2, 2}. If the sample data is representative of the rat population, how many units in the entire apartment complex have 3 rats?

Answer 1

{2, 5, 3, 1, 0, 3, 7, 2, 2} is the data set. We can find this by finding relative frequency of 3 = 2/9 = 0.22 and then 150 times .22 = 33 units