（2）该餐厅每天的营业额在平均营业额 ±760元内的概率
A: $1-2\Phi(-\frac{760}{800/\sqrt{3}})$
B: $1-2\Phi(\frac{760}{800/\sqrt{3}})$
C: $2\Phi(\frac{760}{800/\sqrt{3}})$
D: $2\Phi(-\frac{760}{800/\sqrt{3}})$
A: $1-2\Phi(-\frac{760}{800/\sqrt{3}})$
B: $1-2\Phi(\frac{760}{800/\sqrt{3}})$
C: $2\Phi(\frac{760}{800/\sqrt{3}})$
D: $2\Phi(-\frac{760}{800/\sqrt{3}})$
举一反三
- 连续地掷一枚骰子80次，求点数之和超过300的概率． A: $1-\Phi(\frac{296.5}{\sqrt{35/12}})$ B: $\Phi(\frac{20}{\sqrt{700/3}})$ C: $1-\Phi(\frac{20}{\sqrt{700/3}})$ D: $\Phi(\frac{296.5}{\sqrt{35/12}})$
- 题目包含多个选项，但学生只能选择一个答案。1、连续地掷一枚骰子80次，求点数之和超过300的概率． A: $1-\Phi(\frac{296.5}{\sqrt{35/12}})$ B: $\Phi(\frac{20}{\sqrt{700/3}})$ C: $1-\Phi(\frac{20}{\sqrt{700/3}})$ D: $\Phi(\frac{296.5}{\sqrt{35/12}})$
- 内接于半径为a的球且体积最大的长方体的长、宽、高分别为( )。 A: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) B: \( (\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }},\frac { { 2a}} { { \sqrt 2 }}) \) C: \( (\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }},\frac { { a}} { { \sqrt 3 }}) \) D: \( (\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }},\frac { { 2a}} { { \sqrt 3 }}) \)
- Solve $\int_{-\frac{1}{2}}^1{1-x^2}dx=$? A: $\frac{\pi}{3}+\frac{\sqrt{3}}{8}$. B: $\frac{\pi}{2}$. C: $\frac{\pi}{6}+\frac{\sqrt{3}}{4}$. D: $\frac{\pi}{4}$.
- 函数$f(x,y)=\sqrt{1+{{y}^{2}}}\cos x$在点$(0,1)$处的1次Taylor多项式为 A: $\sqrt{2}-\frac{1}{\sqrt{2}}(y-1)$ B: $\frac{\sqrt{2}}{2}+\frac{1}{\sqrt{2}(}y-1)$ C: $2\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$ D: $\sqrt{2}+\frac{1}{\sqrt{2}}(y-1)$