Expected Uses of Probability
نویسنده
چکیده
Nothing tricky here, just setting up notation. I’ll try to not be overly formal. A random variable is just a quantity that we take to vary randomly. For example, the outcome of a standard six-sided dice roll, say D6, is a random variable. We can now discuss the probability of certain events, which we’ll denote P(•). For instance, we can write P(D6 = 1) = P(D6 = 2) = · · · = P(D6 = 6) = 1 6 or P(D6 = 0) = 0 and P(D6 ≥ 4) = 12 . We can also discuss the expected value of a random variable X, which is the “average” value. The formal definition is
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