题目

1. Nothing can compensate for the loss of one’s health. A. take up         B. make up       C. stay up        D. keep up 2. Encourage your kid to reach a compromise between what he wants and what you want. A. 承诺                B. 损害            C. 折中           D. 理解 3. The educator urged that the study of history should be compulsory in school. A. required             B. deleted         C. organized   D. ignored 4. The two parties holding different views on the issue conflicted at the meeting. A. 某制造商3月生产了一批乒乓球，随机抽样100个进行检查，测得每个球的直径(单位：mm)，将数据分组如下： 分组 频数 频率 [39.95,39.97) 10 [39.97,39.99) 20 [39.99,40.01) 50 [40.01,40.03] 20 合计 100 (1)请在上表中补充完成频率分布表(结果保留两位小数)，并在图中画出频率分布直方图； (2)若以上述频率作为概率，已知标准乒乓球的直径为40.00 mm，试求这批球的直径误差不超过0.03 mm的概率； (3)统计方法中，同一组数据经常用该组区间的中点值(例如区间[39.99,40.01)的中点值是40.00)作为代表．据此估计这批乒乓球直径的平均值(结果保留两位小数)．