方差公式转变过程S²=1/n[(x1-x拔) ²+(x2-x拔)²+……+(xn-x) ²]转变到S²=1/n[x1²+x2²+x3²+……+nx拔²]
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![方差公式转变过程S²=1/n[(x1-x拔) ²+(x2-x拔)²+……+(xn-x) ²]转变到S²=1/n[x1²+x2²+x3²+……+nx拔²]](/uploads/image/z/9277613-53-3.jpg?t=%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%BD%AC%E5%8F%98%E8%BF%87%E7%A8%8BS%26sup2%3B%3D1%2Fn%5B%28x1-x%E6%8B%94%29+%26sup2%3B%2B%EF%BC%88x2-x%E6%8B%94%EF%BC%89%26sup2%3B%2B%E2%80%A6%E2%80%A6%2B%28xn-x%29+%26sup2%3B%5D%E8%BD%AC%E5%8F%98%E5%88%B0S%26sup2%3B%3D1%2Fn%5Bx1%26sup2%3B%2Bx2%26sup2%3B%2Bx3%26sup2%3B%2B%E2%80%A6%E2%80%A6%2Bnx%E6%8B%94%26sup2%3B%5D)
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/11 04:55:15