The target population is all students in your university. You wish to estimate the average current Visa balance for each student.

The target population is all students in your university. You wish to estimate the average current Visa balance for each student. How large would the university student population have to be in order to be regarded as effectively infinite in each of the following samples?(a) A sample of 20 students.(b) A sample of 60 students.(c) A sample of 120 students.