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What is Expected Values of Discrete Random Variables about?

1. A random variable is a variable that can take a set of possible values each with a probability assigned. The probabilities of all possible values must sum to 1. 2. A discrete random variable can only take on a finite or countable number of possible values. Examples include the number obtained when a die is rolled or the number of defective items in a lot. 3. The probability mass function (pmf) gives the probabilities of each possible value of a discrete random variable. The expected value or mean of

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