一、数学期望的定义 1.离散型RV的数学期望 引例:掷一枚骰子,掷出第i面得i分,某人掷了n次,求其所得的平均分。 定义1.设离散型R的分布律P{X=xn}=pnn=1,2,…

色谱分析习题(P372) 1.解:tr1=3min20s=3×60+20=200s tr2=3min50s=3×60+50=230s tM-20s Yi()=1.7mm=1.7/10×60s=10.2s 因为Y(1)=40

质点的质量 m 与速度矢量v 的乘积 p = mv 当作用于质点的力F 的大小和方向都保持不变，作用时间为t ，则该力在这段时间内的冲量I = F t

Binary dependent variables Recall the linear probability model, which can be written as P(=1x)=Bo+xB a drawback to the linear probability model is that predicted values are not constrained to be between 0 and An alternative is to model the proba、,s a function, G(Bo+xB), where 0