题目内容
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[主观题]
设随机变量X的密度函数为f（x)=Ae－|x|，－∞＜x＜＋∞，求： （1)系数A； （2)P（0＜X＜1)； （3)X的分布函数．
设随机变量X的密度函数为f(x)=Ae-|x|，-∞＜x＜+∞，求：
(1)系数A；
(2)P(0＜X＜1)；
(3)X的分布函数．
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A．living room
B．fitting room
C．sitting room
D．dressing room
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第1题
The room designed to try on in the shopping mall is often called ___________ or ____________.
第2题
The shopping mall intends to_______ customers by renovating the mall itself.A．contactB．att
The shopping mall intends to_______ customers by renovating the mall itself.
A．contact
B．attend
C．attract
D．meet
第3题
The meaning of the word “shopaholic” is
A、shopping addict
B、shopping mall
C、shopping list
D、shopping guide
第4题
United States advertising agencies are increasingly using interviews at shopping malls, ca
lled "mall intercepts", to test for advertising effectiveness, product concept viability, and consumer buying habits. Critics of mall intercepts maintain that the shopping habits of mall shoppers are not representative of those of the larger population. Which of the following, if true, would provide evidence that most supports the critics claim about mall intercepts？
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A．Some mall shoppers patronize more than one store in any given shopping trip.
B．Mall shoppers, on average, spend 50 percent more time shopping than shoppers at other locations do.
C．In the course of any year, 95 percent of all households in the United States have at least one member who does some shopping at a mall.
D．Mall shoppers who use public transportation to reach the mall tend to have lower incomes than mall shoppers who drive to the mall.
E．Indoor malls often attract the customary numbers of shoppers even during inclement weather when outdoor malls are likely to lose business.
第6题
Why was com bread called "journey cake"？A．It was easy to ship from England.B．Horses occasi
Why was com bread called "journey cake"？
A．It was easy to ship from England.
B．Horses occasionally ate it if there was no grain available.
C．People took it with them when they traveled.
D．It was easy to prepare over an open fire in the forests.
第8题
Why has leisure time become big business？A．Because shopping is an important leisure time a
Why has leisure time become big business？
A．Because shopping is an important leisure time activity.
B．Because spending a day at a giant mall has become a fashion.
C．Because visiting a museum is a popular leisure time activity.
D．Because enormous amounts of money are spent on leisure time activities.
第9题
What makes Stone Hill Mall a more favourable shopping place is ______.A．the prices in the
What makes Stone Hill Mall a more favourable shopping place is ______.
A．the prices in the shops
B．the weather in the area
C．the children facilities
D．the conditions inside the mall
第10题
You can bring your cat or dog to the shopping mall during Christmas.A．True.B．False.
You can bring your cat or dog to the shopping mall during Christmas.
A．True.
B．False.
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