样本数据3,6,a,4,2的平均数是5,则这个样本的方差是A.8 B.5 C.2√2 D.3算了好几遍都发现选项里没这个答案,请问我的过程是哪里算错了?(3+6+4+2+a)/5=5(15+a)/5=5a=10S²=1/5[(3-10)²+(6-10)
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![样本数据3,6,a,4,2的平均数是5,则这个样本的方差是A.8 B.5 C.2√2 D.3算了好几遍都发现选项里没这个答案,请问我的过程是哪里算错了?(3+6+4+2+a)/5=5(15+a)/5=5a=10S²=1/5[(3-10)²+(6-10)](/uploads/image/z/2566798-70-8.jpg?t=%E6%A0%B7%E6%9C%AC%E6%95%B0%E6%8D%AE3%2C6%2Ca%2C4%2C2%E7%9A%84%E5%B9%B3%E5%9D%87%E6%95%B0%E6%98%AF5%2C%E5%88%99%E8%BF%99%E4%B8%AA%E6%A0%B7%E6%9C%AC%E7%9A%84%E6%96%B9%E5%B7%AE%E6%98%AFA.8+B.5+C.2%E2%88%9A2+D.3%E7%AE%97%E4%BA%86%E5%A5%BD%E5%87%A0%E9%81%8D%E9%83%BD%E5%8F%91%E7%8E%B0%E9%80%89%E9%A1%B9%E9%87%8C%E6%B2%A1%E8%BF%99%E4%B8%AA%E7%AD%94%E6%A1%88%2C%E8%AF%B7%E9%97%AE%E6%88%91%E7%9A%84%E8%BF%87%E7%A8%8B%E6%98%AF%E5%93%AA%E9%87%8C%E7%AE%97%E9%94%99%E4%BA%86%3F%EF%BC%883%2B6%2B4%2B2%2Ba%EF%BC%89%2F5%3D5%EF%BC%8815%2Ba%EF%BC%89%2F5%3D5a%3D10S%26%23178%3B%3D1%2F5%5B%EF%BC%883-10%EF%BC%89%26%23178%3B%2B%EF%BC%886-10%EF%BC%89%26%2317)
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