期望值 導覽選單改善下呢篇文改改呢篇文
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維基百科清理
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期望值
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 | 呢篇文可能要清理或重寫，以符合維基百科更高嘅質量標準。 如果你做得到，可以改善下呢篇文。 |
 | 呢篇文（或呢段）要按維基百科格式，以達到維基百科嘅品質標準。 麻煩幫手改改呢篇文，特別係啲分段同埋相關嘅連結。（幫下我） |
統計學上，期望值(expected value)，又叫平均，係個亂變值同佢嘅或然率x埋（或者 in 埋）例如: 擲公字，公嘅比率係50%，如果擲到公有10分，期望值就係 5分
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- 維基百科清理
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