What is the difference between a continuous and discrete random variable?

1. What is the difference between a continuous and discrete random variable?
2. Would you consider the temperature outside a discrete random variable? Why or why not?
3. Suppose a piggy bank contains 100 coins (25 pennies, 25 dimes, 25 nickels, and 25 quarters). Let the random variable X represent the total value of five randomly selected coins. Is X a discrete or continuous random variable?
4. What are the properties of a continuous distribution?
5. What are the properties of a discrete distribution?
6. Give an example of a discrete and a continuous random variable.
7. Give examples of three different discrete random variables.
8. Give examples of three different continuous random variables.
9. Can you describe a random variable Y that is both discrete and continuous?