ผลต่างระหว่างรุ่นของ "Probstat/notes/random variables"
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| + | : ''This is part of [[probstat]].'' | ||
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In many cases, after we perform a random experiment, we are interested in certain quantity from the outcome, not the actual outcome. In that case, we can define a ''random variable'', which is a function from the sample space to real numbers, to represent the random quantity that we are interested in. | In many cases, after we perform a random experiment, we are interested in certain quantity from the outcome, not the actual outcome. In that case, we can define a ''random variable'', which is a function from the sample space to real numbers, to represent the random quantity that we are interested in. | ||
รุ่นแก้ไขเมื่อ 02:25, 18 กันยายน 2557
- This is part of probstat.
In many cases, after we perform a random experiment, we are interested in certain quantity from the outcome, not the actual outcome. In that case, we can define a random variable, which is a function from the sample space to real numbers, to represent the random quantity that we are interested in.
For example, consider the following experiment. We toss two dice. Let a random variable X be the sum of the values of these two dice.
A random variable X also induces events related to it. For example, we can consider the event that X=10.
