【单选题】【消耗次数：1】
设随机变量和的密度函数分别为若与相互独立，则（）
①
1
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相关题目
【单选题】
设X，Y是相互独立的两个随机变量，它们的分布函数分别为FX(x),FY(y),则Z = max {X,Y}的分布函数是
①
FZ（z）= max { FX(x),FY(y)}
②
FZ（z）= max { |FX(x)|,|FY(y)|}
③
FZ（z）= FX（x）·FY(y)
④
都不是
【单选题】
设连续型随机变量X的分布函数为F(x)=A+Barctan x，则常数A和B分别为（ ）
①
1/2, 1/π
②
1/4, 1/2
③
1/2, 1/4
④
1/π, 1/π
【单选题】
设连续型随机变量X的分布函数为F(x)=A+Barctan x，则常数A和B分别为（ ）
①
1/2, 1/π
②
1/4, 1/2
③
1/2, 1/4
④
1/π, 1/π
【单选题】
设f(x)和g(x)分别为随机变量X和Y的分布函数，为使F(x)=af(x)-bg(x)是某一随机变量的分布函数，则下列给定的各组数值中应取。
①
a=3/5,b=-2/5
②
a=2/3,b=2/3
③
a=-1/2,b=3/2
④
a=1/2,b=-3/2
随机题目
【单选题】
His explanation is not at all clear. I find it ____.
①
essential
②
confusing
③
awful
④
puzzled
【单选题】
Things never went _____ as we had expected
①
so smoothly
②
smooth
③
so smooth
④
smoothly
【单选题】
Everyone of them _______ tired and wanted a good rest.
①
seems
②
is seemed
③
was seemed
④
seemed
【单选题】
Peter: How about going to the movies tonight then?Mary: ____
①
I don’t know.
②
The movie is very interesting.
③
That sounds good.
④
The movie is very boring.
【单选题】
John was going to _______ Mary by telling his friends how much weight she had gained.
①
essential
②
embarrass
③
elementary
④
consider
【单选题】
The classroom is quite clean ____ some waste paper on the floor.
①
without
②
besides
③
except
④
except for
【单选题】
All the men were under heavy____ working day and night
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prize
②
rain
③
pressure
④
reward
【单选题】
—I’ve got an offer in New York. —Oh, ____! But I’m going to miss you.
①
That’s too bad
②
I’m sorry
③
I beg your pardon
④
That’s great
【单选题】
The ____child was learning to walk again gradually.
①
broken
②
harmed
③
injured
④
enable