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【简答题】
某厂生产的电灯泡的使用寿命X(单位：h))服从正态分布N(1600，σ 2 )．如果要求电灯泡的使用寿命在1200h以上的概率不小于0.975，问σ应取什么值?
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反馈参考答案：
举一反三
【单选题】The Chairman recently blamed the group's poor performance on
A.
lack of customer consultation.
B.
the country's economic situation.
C.
continuing internal problems.
【简答题】反馈信号的大小与输出电压成比例的反馈称为 。
【单选题】Which demographic do managers pay closest attention to with respect to large-scale trends in the business world?
A.
age
B.
sex
C.
employment status
D.
geographic location
【简答题】音的四种物理属性: 、 、 、 。
【单选题】Current demographic trends, such as the fall in the birth rate, should favor ______ economic growth in the long run.
A.
slow
B.
quickened
C.
speeded
D.
accelerated
【判断题】To perform an external audit, a company first must gather competitive intelligence and information about social, cultural, demographic, environmental, economic, political, legal, governmental, and tec...
A.
正确
B.
错误
【单选题】Which of the following demographic trends is the most likely cause for a rapid increase in telecommuting?
A.
the migration toward micropolitan and suburban areas
B.
the migration from rural to metropolitan areas
C.
the increasing number of traditional households
D.
the growing percentage of married couples who do not have children
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