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【简答题】
某人射击 次,命中 ~ 环的概率如下图所示: 命中环数 环 环 环 环 概率 则“射击 次,命中不足 环”的概率为 .
题目标签:
射击
概率
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【简答题】(10分)在区间(0,1)中随机地取两个数X,Y,求这两个数X,Y中较小的数小于 的概率。
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【简答题】在区间[- π 2 , π 2 ]内任取一个实数x,则所取实数x落在函数y=2sin(2x+ π 6 )增区间内的概率为______.
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【单选题】从中任取两球都是黑球的概率为()。 A.5/33 B.7/22 C.5/12 D.7/12
A.
在一个盒子里装有均匀的已编有不同号码的五个白球和七个黑球,则:
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【单选题】当概率保证度为95 .45%时,抽样平均误差比抽样极限误差( )。
A.
大2倍
B.
小2倍
C.
前者是后者的l/2
D.
后者是前者的1/2
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【判断题】避雷线的保护角越大,对导线直击雷保护越可靠,所以对导线雷击概率就越小。
A.
正确
B.
错误
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【简答题】连续抛掷三枚硬币,出现两个反面向上一个正面向上的概率是
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【简答题】有甲、乙、丙三个盒子,甲盒子中有2个红球4个白球,乙盒子中有4个红球2个白球,丙盒子中有3个红球3个白球,设在三个盒子中取球的机会相同,现从中取到1个红球,求它是从甲盒子中取到的概率.
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【单选题】Mr.Tuner had been a captain for many years. He was good at shooting (射击). In the army he taught new soldiers to shoot. Then he left the army and began to work in a bank as a night watchman. He worked ...
A.
The young man was good at shooting.
B.
Mr.Turner liked the young man very much.
C.
Mr.Turner disliked the young man.
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【单选题】Mr.Tuner had been a captain for many years. He was good at shooting (射击). In the army he taught new soldiers to shoot. Then he left the army and began to work in a bank as a night watchman. He worked ...
A.
Worked as a guard.
B.
Worked as a driver.
C.
Worked as a teacher.
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【单选题】在故障情况下使用前接点闭合的概率 ( ) 后接点闭合的概率。
A.
大于
B.
等于
C.
小于
D.
大于等于
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