X为正态分布,均值μ=27,标准差σ=4,则X大于41的概率为()。
A: F(3.50)
B: 1+F(3.50)
C: 1-F(3.50)
D: 1-R(3.50)
A: F(3.50)
B: 1+F(3.50)
C: 1-F(3.50)
D: 1-R(3.50)
举一反三
- A total asset turnover ratio of 3.5 indicates that A: For every $1 in sales, the firm acquired $3.50 in assets during the period. B: For every $1 in assets, the firm produced $3.50 in net sales during the period. C: For every $1 in assets, the firm earned gross profit of $3.50 during the period. D: For every $1 in assets, the firm earned $3.50 in net income. E: For every $1 in assets, the firm paid $3.50 in expenses during the period.
- 设随机变量X~N(1,1),概率密度为f(x),分布函数F(x),则下列正确的是() A: P{X≤0}=P{X≥0} B: P{X≤1}=P{X≥1} C: f(x)=f(-x),x∈R D: F(x)=1-F(-x),x∈R
- 3.50大于5.2。( )
- 若X~N(1,1),记其密度函数为f(x),分布函数为F(x),则()? A: P(X≤0)=P(X≥0) B: F(X)=1-F(-X) C: P(X≤1)=P(x≥1) D: f(x)=f(-x)
- 设随机变量X服从正态分布N(1,σ2),其分布函数为F(x),则对任意实数x,有______。 A: F(x)+F(-x)=1 B: F(1+x)+F(1-x)=1 C: F(x+1)+F(x-1)=1 D: F(1-x)+F(x-1)=1