Sort the missing terms in the order they're supposed to appear in the following text:
"The [1] of an event is its frequency in the long run, if the experiment is carried out long enough. We use [2] to organize and describe and summarize our sample data. With [3], you study a small sample of data and try to determine if that data can predict whether a hypothesis works for the entire population. [4] is a tool for summarizing data on an unknown population."