大于等于dfrac (1)(2)B. 小于等于dfrac (1)(2)C. 小于等于dfrac (1)(2)D. 大于等于dfrac (1)(2)

调整某种仪器 100 台 ,设调整无误的概率为 0 ，调整过大成过小的概率都是，用切比雪夫不等式估计调整过大的仪器数在 40 台到 60 台之间的概率范围是

A . 大于等于

B. 小于等于

C. 小于等于

D. 大于等于

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