ex_0523 - The fundamental counting principle This principle...

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The fundamental counting principle This principle states that "If there are r ways to do one thing, and s ways to do another, and t ways to do a third thing, and so on ..., then the number of ways of doing all those things at once is r x s x t x ..." Let's look at an actual example and try to make sense of this rule. How about a license plate... How many different license plates are there altogether? Look at what's used to make a plate: LETTER LETTER LETTER NUMBER NUMBER NUMBER For each of the letters we have 26 choices. For each of the numbers we have 10 choices. The number of ways to pick the first letter The number of ways to pick the second letter The number of ways to pick the third letter The number of ways to pick the first number The number of ways to pick the second number The number of ways to pick the third number 26 26 26 10 10 10 The Fundamental Counting Principle says that: The total number of ways to fill the six spaces on a licence plate is 26 x 26 x 26 x 10 x 10 x 10 which equals 17,576,000 Exercise on May23
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1. Binomial settings. Which of the following random variables describe a binomial random variable?
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