Which of these is an example of continuous random variable a. number of flights leaving an airport b. distance of a javelin throw c. pieces of mail in your mailbox d. attendance at a sporting event

The correct answer would be Choice B. Distance of a javelin throw.

A continuous random variable is a variable that can be any number between the integers not just the integers themselves.

For example, the distance for a javelin throw could be 6.70819203 feet.
However, you would not say that you have 6.70819203 flights, pieces of mail or people at a sporting event.