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.From 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