皮皮学，免费搜题
登录
搜题
【多选题】
设随机变量X服从均值为2的指数分布，X的分布函数为F(x)，数学期望为E(X)，方差为D(X)，则以下结果正确的是A.
B.
D(X)=4
C.
P(X>2 ︱ X>1)=1-F(1)
D.
P(X>2 ︱ X>1)= F(1)
E.
F.
D(X)=E(X)
G.
P(X ≤ 2 ︱ X>1)= F(2)
H.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】Select all the claims about cause and effect:
A.
The death penalty does not deter violent crime.
B.
A mandatory jail sentence and loss of driver’s license should be imposed for drunk driving violations.
C.
Pop music weakens the moral fiber of the youth.
D.
Letter grades should change to pass/fail in nonmajor courses.
【单选题】About Liz Neumark, the passage claims all of the following EXCEPT that______.
A.
she is the cofounder and CEO of a catering company
B.
she has her own organic farm in upstate New York
C.
she likes teaching children planting and cooking on her farm
D.
she loves cooking, eating, gardening, and the most important, children
【单选题】【范贞珍】下列说法有误的一项是( )
A.
闻虎旅传宵柝 虎旅:跟随唐玄宗赴蜀的禁卫军。
B.
时七夕笑牵牛 唐玄宗和杨贵妃认为天上的牛郎织女一年只能相会一次,自己则可永世相守,因此“笑牵牛”。
C.
复鸡人报晓筹 鸡人报晓:汉代制度宫中养鸡的人,专门传唱报晓。
D.
及卢家有莫愁 莫愁:古时洛阳女子。南朝乐府歌辞《河东之水歌》道:“莫愁十三能织绮,十四采桑南陌头,十五嫁为卢家妇,十六生儿字阿侯。”极写莫愁婚姻的美满。
【单选题】Do the following statements agree with the claims of the writer in Reading Passage 3? In boxes 6 - 10 on your answer sheet, write YES if the statement agrees with the claims of the writer NO if the st...
A.
YES
B.
NO
C.
NOT GIVEN
【简答题】十二经别的循行分布具有(),(),(),()的特点,是从正经别行深入体腔的支脉。
【单选题】About Liz Neumark, the passage claims all the following EXCEPT that______.
A.
she is the cofounder and CEO of a catering company
B.
she has her own organic farm in upstate New York
C.
she likes teaching children planting and cooking on her farm
D.
she loves cooking, eating, gardening, and most important, children
相关题目：