The Average Age in a Sample of 90 Students at City

Multiple Choice

The average age in a sample of 90 students at City College is 20. As a result of this sample, it can be concluded that the average age of all the students at City College

A) must be more than 20, since the population is always larger than the sample
B) must be less than 20, since the sample is only a part of the population
C) could not be 20
D) could be larger, smaller, or equal to 20