Edexcel IAL AS / A Levels Statistics 1 Chapter 5 Discrete Random Variable - 2

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Edexcel IAL International AS / A Levels Statistics 1 (S1) Chapter 5 Discrete Random Variable Part 2. We discuss the concepts of cumulative distribution function and expected value for a random variable.
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how do we know that there arent any values that are greater than 3 in the sample space because x>5. could that not mean that x=6 is a possible value?

losttrash