A. 0.2267
B. 0.3896
C. 0.4632
D. 0.6826
已知X~N(1,4),则P |X-1| leq 2 =______Phi(1)=0.8413,Phi(2)=0.977236.(1.6分)已知X~N(1,4),
[判断题] 1atm约等于100mmH2O。()A . 正确B . 错误
5.某型号的灯管寿命(以小时计) backsim N(1000,(100)^2) (circled (1)(2)=0.9772 circled (1)(1)=0
[单选题]1盎司约等于()毫升。A . 10B . 15C . 20D . 30
[单选题]1rad约等于()。A .180°B .57.296°C .0.017°D .28.648°
[单选题]1mmHg约等于()。A .760PaB .133.3PaC .9.8PaD .273Pa
[单选题]1ga1(英)约等于()。A . 3.785LB . 6LC . 8LD . 4.546L
[问答题] 1kgf约等于多少?
8.设X~N(-1,3²),且Φ(2)=0.9772,Φ(3)=0.9987,Φ(1.5)=0.9332,Φ(1)=0.8413,Φ(0.5)=0.6915,则