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random variables. See Book Examples 3.5.1 – 3.5.4. Notice the notation . Reminder: we can have
theoretical or frequency-based probabilities—see Book Page 86.
We can find the mean and variance (and standard deviation) of a random variable, just as we found the
mean and variance of a collection of data. Another way to describe the mean of a random variable
is the random variable and
are one of the possible values
can take, that is, where
value occurring then
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