【单选题】【消耗次数：1】
概率和频率的描述，正确的是（）。
①
概率就是频率
②
概率可以大于1
③
频率是相对样本而言的
④
某一随机事件的概率可以改变
⑤
概率比频率小
参考答案：
复制
纠错
相关题目
【单选题】
对小概率风险事件的管理正确的是（）。
①
由于其概率较小，相对风险投入不需要过大
②
虽然其概率较小，但是其也可能发生，仍然需要引起高度的重视
③
对小概率风险事件只需要实施监控即可
④
小概率风险事件造成的风险损失不一定微小
【单选题】
下列关于概率的说法，错误的是（）。
①
通常用P表示
②
大小在0到1之间
③
某事件发生的频率即概率
④
在实际工作中，概率是难以获得的
⑤
某时间发生的概率P≤0.05，称为小概率事件
【单选题】
如果要估计抛掷一枚图钉时尽头朝上的概率，为了有95%以上的把握保证所观察到的频率与概率p的差小于p/10。问至少应该作（ ）次实验
①
200
②
300
③
400
④
500
【单选题】
小概率事件在统计学上的含义是（）。
①
指发生概率P≥0.5的随机事件
②
指一次实验或者观察中绝对不发生的事件
③
在一次实验或者观察中发生的可能性很小的事件，一般指P≤0.05
④
在一次实验或者观察中发生的可能性较大的事件，一般指P0.05
⑤
以上说法均不正确
随机题目
【单选题】
The government enacted new laws to ________________ terrorism(恐怖主义).
①
fight for
②
fight against
③
fight in
④
fight at
【单选题】
Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Some explode with anger, and scream and shout. But other people keep their anger inside. They can not or will not express it. This is called repressing anger. Many doctors think that repressing anger is more dangerous to a person’s health than expressing it. They say that when a person is angry, the brain gives out the same hormones (荷尔蒙) as that are produced during tense and nervous situations. They speed the heart rate and raise blood pressure, so the person feels excited and ready to act. Repressing these feelings will only make the feelings continue, and this can lead to many medical problems. To prevent these problems, these doctors suggest letting the anger out by expressing it freely. But recently some other doctors question this. They say that people who express anger repeatedly and violently become, in fact, more but not less angry. And this could cause medical problems. However, some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger strongly may be more likely to develop heart diseases, and that those who keep their anger inside may face a greater danger of high blood pressure. Doctors say the solution is to learn how to deal with anger. The first step is to admit that you are angry and to recognize the real cause of the anger, and then to decide if the cause is serious enough to get angry about. If it is, do not express your anger while angry. Wait until your anger has cooled down, and express yourself calmly and reasonably. Doctors also say that a good way to deal with anger is to find humor in the situation that has made you angry, for laughter is much healthier than anger.What is the main idea of this passage?
①
Anger should be dealt with in a proper way.
②
Different people deal with anger in different ways.
③
Doctors suggest dealing with anger by repressing it.
④
The best way to deal with anger is to laugh when angry.
【单选题】
It is _____________ that today people in some remote areas know about the rest of the world.
①
difficult
②
amazing
③
inferior
④
superior
【单选题】
They dont____________ the importance of this problem.
①
understands
②
understood
③
understanding
④
understand
【单选题】
The people who ____________ cars work very quickly.
①
astonish
②
assemble
③
afford
④
acquire
【单选题】
Tommy: Mommy, when will we have dinner? I’m starving.Mother: __________ We have to wait for Daddy.
①
OK, honey.
②
Quickly, honey.
③
Soon, honey.
④
All right, honey.
【单选题】
He____________ cold and hunger a great deal.
①
escaped from
②
suffered from
③
kept away from
④
came from
【单选题】
Youdonthavetobeinsuchahurry,Iwouldratheryou________onbusinessfirst.
①
wouldgo
②
willgo
③
went
④
havegone
【单选题】
Now it is illegal (非法的) to kill ______________ for their ivories.
①
tigers
②
lions
③
elephants
④
birds