自动随机组卷的考试质量严重地依赖于试题库试题的得分概率和答题时间概率分布的准确程度。
The quality of random auto-examination set is based heavy on the accuracy of exam-question score probability and probability distribution of answer-question time.
无纸考试系统理想的组卷方式是根据试题得分概率和答题时间概率分布自动组卷，使所组卷子的预期考试成绩和答题时间数学期望和方差符合要求。
A ideal exam-paper formation algorithm of a no-paper examination system automatically makes a exam-paper to meet pre-demands of exam-grade distribution and exam-time.
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