已知随机变量X服从正态分布N(3,1),若P(1<X<5)=a,P(0<X<6)=b,则P(0<X≤1)=______.

已知随机变量X服从正态分布N(3,1),若P(1<X<5)=a,P(0<X<6)=b,则P(0<X≤1)=______.

题型:不详难度:来源:
已知随机变量X服从正态分布N(3,1),若P(1<X<5)=a,P(0<X<6)=b,则P(0<X≤1)=______.
答案
∵随机变量X服从正态分布N(3,1),
∴曲线关于直线x=3对称
∵P(1<X<5)=a,P(0<X<6)=b,
∴P(1<X<3)=
a
2
,P(0<X<3)=
b
2

∴P(0<X≤1)=
b
2
-
a
2

故答案为:
b
2
-
a
2
举一反三
设ξ~N(0,1),且P(|ξ|<b)=a(0<a<1,b>0),则P(ξ≥b)的值是______(用a表示).
题型:不详难度:| 查看答案
设随机变量ξ~N(μ,δ2),且data:image/png;base64,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,则P(0<ξ<1)的值为(  )
题型:不详难度:| 查看答案
A.data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAkCAYAAAB8DZEQAAAAZ0lEQVRIiWNgGAWjAB0oKSn9p6nhMEwzS5AtG7Vk1BLqG46OaWbZKBgBQFFR8TkxGKaerBSooKAgQQxG1oNuME2S+qglJFtCUdFDjGaKXE5MMFBceNIlrAlZOmrBwFtAl0w2WsfDAACnmlzjJXWCrwAAAABJRU5ErkJggg==B.1-pC.1-2pD.data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAkCAYAAADo6zjiAAAAdUlEQVRYhe2VQQrAMAgE84we1f//q89oT0IIPUgXstLugLeAk4TVMYToTERctMZZFIFZRAIS+KfAHMMWcRRiC+5+VirPPyUl0/IqRWZ2VKp6obXp9ihLoIUANMrRPQDdGH0+eInR/2+FKqDmLZrThwg9BZ/mBuF/ZUHX4rmpAAAAAElFTkSuQmCC
某大型国有企业为10000名员工定制工作服,设员工的身高(单位:cm)服从正态分布N(173,52),则适合身高在163cm-183cm范围内员工穿的服装大约要定制(  )
题型:不详难度:| 查看答案
A.6826套B.9544套C.9520套D.9974套
正态总体N(0,)中,数值落在(-∞,-2)∪(2,+∞)内的概率是(  )
题型:不详难度:| 查看答案
A.0.46B.0.997C.0.03D.0.0026
某市组织一次高三调研考试,考试后统计的数学成绩服从正态分布,其密度函数为data:image/png;base64,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,则下列命题不正确的是(  )
题型:不详难度:| 查看答案
最新试题
热门考点

超级试练试题库

© 2017-2019 超级试练试题库,All Rights Reserved.

A.该市这次考试的数学平均成绩为80分
B.分数在120分以上的人数与分数在60分以下的人数相同
C.分数在110分以上的人数与分数在50分以下的人数相同
D.该市这次考试的数学标准差为10