The number of calibration curve: apparatus can store 9 calibration curve, 5 for one line, 4 for binomial parabola.
校正曲线数：仪器可存储9条标定曲线，5条为一元一次直线，4条为二项式抛物线。
This paper begins with the binomial distribution in the random theory and then furthers on analysis of the distributive curve of Galton board experiment.
从随机理论中的二项式分布出发，定量分析了伽尔顿板实验，给出了分布函数。
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