【判断题】【消耗次数：1】
随机向量（X,Y）服从二元正态分布，则X的边际分布为正态分布，Y的边际分布也为正态分布.
①
正确
②
错误
参考答案：
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相关题目
【单选题】
两个相互独立的随机变量X和Y分别服从正态分布N(0,1)和N(1,1)，则
①
<img class=jc-formula data-tex=P(X+Y\le 0)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/2D796C16E4ADCDC598AFA0E462095A7C.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=P(X+Y\le1)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/7CB2C1C70ED2C80A1B88E527EB9CA463.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=P(X-Y\le 0)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/FB3B9FB1D8E1D2482BA90188CE469A84.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=P(X-Y\le 1)=\frac { 1 }{ 2 } src=https://huaweicloudobs.ahjxjy.cn/03DC9D32FBCAC18FA548285A7F9DF6CC.png style=vertical-align: middle;/>
随机题目
【单选题】
-- How long ______ you ______ the library book?-- For three days.
①
have; borrowed
②
have; kept
③
borrow
④
were; kept
【单选题】
I ____ up early this morning, so I stayed in bed until 8 o’clock a.m. .
①
needn’t have got
②
didn’t need to get
③
shouldn’t have got
④
can’t have got
【单选题】
Only in this way ____ out of the plan.
①
you can talk him
②
him can you talk
③
him you can talk
④
can you talk him
【单选题】
People at the party worried about him, because no one was aware ______ he had gone.
①
of where
②
of the place where
③
where
④
the place
【单选题】
If you drink too much, your health will get even ____.
①
bad
②
poor
③
worse
④
not well
【单选题】
I haven’t seen her for years, but I could still ____ her voice on the phone.
①
recognize
②
realize
③
hear
④
know
【单选题】
As I knew him better, I discovered that my____ had been right.
①
enjoyment
②
improvement
③
impression
④
environment
【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