问题
单项选择题 共用题干题
根据大量调查,已知正常成年男子的心率μ=72次/分,σ=5次/分,从该总体中随机抽样100人为样本。
估计其中心率X≥83.65次/分人大约为()。
A.1
B.0.5
C.2.5
D.5
E.少于1人
答案
参考答案:A
根据大量调查,已知正常成年男子的心率μ=72次/分,σ=5次/分,从该总体中随机抽样100人为样本。
估计其中心率X≥83.65次/分人大约为()。
A.1
B.0.5
C.2.5
D.5
E.少于1人
参考答案:A
根据对话内容及方框中所给的句子补全对话,其中有一项是多余的。 A: Excuse me, sir. 1 B: Sponsor you? What do you nean? A: Well, our class is running a race next weekend. We are asking people to donate money to us after we've done it. B: I see. 2 _ Are you going to spend it on something for your school? A: No. 3 B: What kind of charity? A: The Missionaries of Charity. B: 4 A: They look after people who are poor and sick in different parts of the world. B: 5 I'll donate 200 yuan. A: Great Thank you very much. B: My pleasure. | |
|