Which has the greatest unit rate A 75 books per 5 boxes
B 144 books per 8 boxes
C 156 books per 13 boxes
D 221 books per 17 boxes

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected