Ch253 对于连续型r:VX P(a<X≤b)=P(a≤X≤b =Past<b) f(xy =P(a≤X<b) f(rdx =F(b)-F(a) bCh2-53 对于连续型 r.v. X P(a  X  b) = P(a  X  b) = P(a  X  b) = P(a  X  b) = F(b) − F(a) b x f ( x) -10 -5 5 0.02 0.04 0.06 0.08 a  = b a f (x)d x