一个大样本成年男性舒张压测量资料的均数与中位数均是83mmHg，标准差是 12.25mmHg，则
A．理论上有95%男子的舒张压在59～ 107mmHg之间
B．30～69岁男子的舒张压总体均数 95%的可信区间为59～107mmHg
C．理论上有5%男子的舒张压超过 107mmHg
D．理论上有5%男子的舒张压低于 59mmHg
E．理论上有5%男子的舒张压≤ 83mmHg
参考答案：A
解析：因该资料均数与中位数相等，为对称分布，又因样本量大，故可按正态分布处理。[*]故可得A。
| Complete the sentence with the proper phrase in the box. (用方框里适当的短语完成句子。) | |
2. Our new English teacher, Mr.White, _____ the school today. 3. It's getting late. It's time to _____. 4. If you _____, you can get along with your  classmates.5. The hat under the table _____ a cat. 6. We think keeping pets _____. 7. Which man? The one _____. 8. They are _____. They are very happy. |