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（2013?湖北）假设每天从甲地去乙地的旅客人数X是服从正态分布N（800，50 2 ）的随机变量．记一天中从甲地去乙地的旅客人数不超过900的概率为p 0 ． （1）求p 0 的值； （参考数据：若X～N（μ，σ 2 ），有P（μ﹣σ＜X≤μ+σ）=0.6826，P（μ﹣2σ＜X≤μ+2σ）=0.9544，P（μ﹣3σ＜X≤μ+3σ）=0.9974．） （2）某客运公司用A，B两种型号的车辆承担甲、乙两地间的长途客运业务，每车每天往返一次，A，B两种车辆的载客量分别为36人和60人，从甲地去乙地的营运成本分别为1600元/辆和2400元/辆．公司拟组建一个不超过21辆车的客运车队，并要求B型车不多于A型车7辆．若每天要以不小于p 0 的概率运甲地去乙地的旅客，且使公司从甲地去乙地的营运成本最小，那么应配备A型车、B型车各多少辆？
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【单选题】What is true between data modeling and the formatting of the data?
A.
There is always one specific schema for storing model data that is the best and preferred method for the specific data representation.
B.
There is a one to one correspondence between formatting data and data modeling. For every model of data, there is only one way to store the data.
C.
The data does not necessarily need to be formatted in a way that represents the data model. Just so long as it can be extrapolated.
【单选题】What is a data item?
A.
The real worth of a data value.
B.
Data found in a customer transaction.
C.
Data found in a mediated schema.
D.
Data that represents an aspect of a real-world entity.
【简答题】What types of definition have you learned in Mini-lecture 2? In what way do they mainly differ?
【简答题】神经元与神经元之间或神经元与非神经细胞之间相互接触并传递信息的部位 。
【简答题】In what way is Portable Mini Fridge superior to an Esky? B) It carries more food and drinks. C) It is larger. D) It looks more beautiful.
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【简答题】What types of definition have you learned in Mini-lecture 2? In what way do they mainly differ?
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