Suppose we have yo estimate the average number of purchases in a given hour in a given hour at a convenient store. Using this example describe in your own words how you would go about this determining this average through:

A.) Drawing a random sample
B.) A Systematic sample
C.) A convenient sample

I just need to know if someone could show me an example to this . I have the questions answer just not answered well enough for my instructor if there is a method of showing this I would appreciate it.