若随机变量x~N(1,4),P(x≤0)=m,则P(0<x<2)=(   )A.1-2mB.C.D.1-m

若随机变量x~N(1,4),P(x≤0)=m,则P(0<x<2)=(   )A.1-2mB.C.D.1-m

题型:芜湖二模难度:来源:
若随机变量x~N(1,4),P(x≤0)=m,则P(0<x<2)=(   )
答案
举一反三
A.1-2mB.C.D.1-m
已知随机变量服从正态分布N(M,4),且P(ξ<-2)+P(ξ≤0)=1,则M=(  )
题型:不详难度:| 查看答案
A.-2B.2C.1D.-1
设ξ~N(μ,δ2),且data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAFEAAAAkCAYAAADxYNZEAAAA+klEQVRoge2XQQ6FIAxEPYZL6P3v5TH8KxPzg6GlU7BmXsJGQaZDkbJthBBCCIlHRM7VGtIiIufVVmtJD00EQBMB0EQANBEATQSwzMQvlAb3EicsnqePoiezBpBm8XpCESvoHTsyzo0lfUffWXRo+0ZocPE/eUuMJgtH57aY51noUBAmXn202zlq27ZiWXJYRGYiIgh0JtZaD03riuqtElr4rEzUUErZNW1YVJTw+1jr+BTb2doHIQpxOqO0DIESP6tOfF2JYwkaue20ulrPnjR/4tayMijkXKH/zhQCnKTN7jdBEwOgiU5ooBMa6IQGOuHBAmDKPZuQEH7NV+m8LWtNJAAAAABJRU5ErkJggg==,P(ξ>2)=p,则P(0<ξ<1)=(  )
题型:不详难度:| 查看答案
题型:不详难度:| 查看答案
A.data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABkAAAAkCAYAAAB8DZEQAAAAZ0lEQVRIiWNgGAWjAB0oKSn9p6nhMEwzS5AtG7Vk1BLqG46OaWbZKBgBQFFR8TkxGKaerBSooKAgQQxG1oNuME2S+qglJFtCUdFDjGaKXE5MMFBceNIlrAlZOmrBwFtAl0w2WsfDAACnmlzjJXWCrwAAAABJRU5ErkJggg==B.1-pC.-PD.1-2p
设服从X~(n,p)的随机变量X的期望和方差分别是2.4与1.44,则二项分布的参数n、p的值分别为______.
已知X~N(0,σ2)且P(-2≤X<0)=0.4,则P(x>2)为(  )
题型:不详难度:| 查看答案
题型:不详难度:| 查看答案
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A.0.1B.0.2C.0.3D.0.4
某随机变量X服从正态分布,其概率密度函数为f(x)=
1


e-
x2
8
,则X的期望μ=______,标准差σ=______.