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本帖最后由 erjiac 于 2018-9-8 00:41 编辑
機率是機率,期望值是期望值
你從昨天就搞混了,到今天還沒明白
我特別找了一本文科專用的統計學課本,希望你能理解這兩個名詞的區別
Probability: Probability is a numerical measure of the likehood that an event will occur. Probability values are always asigned on a scale from 0 to 1.
Expected Value: The expected value is a weighted average of the values the random variable may assume. The weights are the probabilities.
Random Variable: A random variable is a numerical description of the outcome of an experiment.
Experiment: A process that generates well-defined outcomes. On any single repetition of an experiment, one and only one of the possible experimental outcomes will occur.
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