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What is population variance?
平均值
差异 方差
Questioner:Benjamin Coleman 2023-06-17 12:10:00
The most authoritative answer in 2024
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Zoe Davis——Studied at the University of Tokyo, Lives in Tokyo, Japan.
In probability theory and statistics,
variance is the expectation of the squared deviation of a random variable from its mean. Informally, it measures how far a set of (random) numbers are spread out from their average value.
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