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我们收集了1988—1989学年第一学期87级、88级中专26门课程的考试成绩资料,对其分布形态进行了粗略分析.1、有12门课程的考试成绩是近正态分布,中等成绩的人数最多,中等以上,中等以下的人数都较少,上下相差不大,绘成分布曲线,形成两边基本对称的单峰微偏分布曲线.其中有的略呈负偏态,如图一(在直角坐标系上,横坐标表分数,纵坐标表人数.下
We collected the first semester of the 1988-1989 academic year 87, 88 secondary vocational school 26 test scores, the distribution of the form of a rough analysis .1, 12 courses exam scores are near normal distribution, medium The results of the largest number of people above average, below the average number of people are less up and down little difference, draw the distribution curve, the formation of the basic symmetry on both sides of the peak distribution curve slightly unilateral, some slightly negative skewness, as shown in Figure 1 (In Cartesian coordinates, abscissa table scores, ordinate table number