题目内容
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Estimate the standard deviation （）
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A．1,715．10 to 4,055．68
B．1,596．45 to 4,466．73
C．39．96 to 66．83
D．41．39 to 63．68
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第2题
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第3题
147A process characteristic has a true mean of 150 and a true standard deviation of 20. A
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第5题
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A . 0.2
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C . 4
D . 5
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