【单选题】【消耗次数：1】
已知随机变量服从泊松分布，且则（）
①
②
1
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相关题目
【单选题】
设随机变量X和Y都服从N（0,1）分布，则下列结论正确的是
①
X+Y服从正态分布
②
X2+Y2服从分布<img class=jc-formula data-tex=\chi src=https://huaweicloudobs.ahjxjy.cn/4144680EC7DF2F36E866B65FACD76996.png style=vertical-align: middle;/>2分布
③
X2和Y2都服从分布<img class=jc-formula data-tex=\chi src=https://huaweicloudobs.ahjxjy.cn/4144680EC7DF2F36E866B65FACD76996.png style=white-space: normal; vertical-align: middle;/>2分布
④
X2/Y2服从F分布
随机题目
【单选题】
The garden _______while the Greens were away from home.
①
took good care of
②
was taken good care
③
was taken good care of
④
was taking good care
【单选题】
We’ve missed the last bus. I’m afraid we have no ________ but to take a taxi.
①
way
②
choice
③
possibility
④
selection
【单选题】
I didn’t know what to do, but then an idea suddenly ________ to me.
①
appeared
②
happened
③
occurred
④
emerged
【单选题】
Youve caught a cold. Youd better _______to school.
①
go
②
to go
③
not go
④
not to go
【单选题】
________ you are leaving tomorrow, we can have dinner together tonight.
①
Since
②
While
③
For
④
Before
【单选题】
Australia is one of the few countries ____ people drive on the left of the road.
①
which
②
that
③
where
④
on which
【单选题】
He _______ driving me home, even though I told him I lived nearby.
①
insisted on
②
insisted at
③
insisted that
④
insisted in