Q:

Difficulty understanding statistics

I am having a very difficult time even grasping the simple concept behind how to tackle some of these problems. 

In 2012, about 24% of high school seniors reported binge drinking
  (defined as 5 or more drinks in a row in the past two weeks), a
  substantial drop since the late 1990s. A simple random sample of 500
  high school seniors is to be taken.
a) Define the population and the sample c) What is the approximate
  distribution of all sample proportions?

Would the overall population be ALL high school seniors and the sample would be the randomly 500 selected high school seniors?
For c: I don't quite understand what it's even asking. How do I compute the distribution of a data set I do not have?

A:

Think about how your random variables look like if you want to model the answers of one person or 500 people.
Regarding c): Be $X_i$ iid then how is $$\sum^{500}_{i=1}X_i$$ approximately distributed? You might want to center and normalize it.

