概率论基础题设总体X只能以等概率论取3个值:1,2,3 现从该总体抽取一个容量为3的样本总体X1,X2,X3 极差R=max{X1,X2,X3}-min{X1,X2,X3} 求P(R=1)答案是这么做的:P(R=1)=1-P(R=0)-P(R=2)=1-3/27-12/27=12/27我想问一
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![概率论基础题设总体X只能以等概率论取3个值:1,2,3 现从该总体抽取一个容量为3的样本总体X1,X2,X3 极差R=max{X1,X2,X3}-min{X1,X2,X3} 求P(R=1)答案是这么做的:P(R=1)=1-P(R=0)-P(R=2)=1-3/27-12/27=12/27我想问一](/uploads/image/z/14295408-24-8.jpg?t=%E6%A6%82%E7%8E%87%E8%AE%BA%E5%9F%BA%E7%A1%80%E9%A2%98%E8%AE%BE%E6%80%BB%E4%BD%93X%E5%8F%AA%E8%83%BD%E4%BB%A5%E7%AD%89%E6%A6%82%E7%8E%87%E8%AE%BA%E5%8F%963%E4%B8%AA%E5%80%BC%3A1%2C2%2C3+%E7%8E%B0%E4%BB%8E%E8%AF%A5%E6%80%BB%E4%BD%93%E6%8A%BD%E5%8F%96%E4%B8%80%E4%B8%AA%E5%AE%B9%E9%87%8F%E4%B8%BA3%E7%9A%84%E6%A0%B7%E6%9C%AC%E6%80%BB%E4%BD%93X1%2CX2%2CX3+%E3%80%80%E6%9E%81%E5%B7%AER%3Dmax%7BX1%2CX2%2CX3%7D-min%7BX1%2CX2%2CX3%7D+%E6%B1%82P%28R%3D1%29%E7%AD%94%E6%A1%88%E6%98%AF%E8%BF%99%E4%B9%88%E5%81%9A%E7%9A%84%3AP%28R%3D1%29%3D1-P%28R%3D0%29-P%28R%3D2%29%3D1-3%2F27-12%2F27%3D12%2F27%E6%88%91%E6%83%B3%E9%97%AE%E4%B8%80)
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