Chapter 8
Counting Principles and Probability Distributions
In This Chapter
◆ Using the fundamental counting principle
◆ Distinguishing between permutations and combinations
◆ Defining a random variable and probability distribution
◆ Calculating the mean and variance of a discrete probability distribution
Well, we’ve finally arrived at our third and last chapter on general probability concepts. This chapter sets the stage for the last three chapters in Part 2, which will focus on specific types of probability distributions. Before you know it, we’ll be knee deep with inferential statistics.
This chapter will also teach you how to count. This type of counting, however, goes far beyond what you’ve seen on Sesame Street. Counting events is an important ...

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