a=12 σ=sqrt(D(x))=sqrt(4)=2 x_(2)=14 (x_(2)-a)/σ=(14-12)/2=1 (x_(1)-a)/σ=(11-12)/2=-1/2 Ф(1)=0,3413 Ф(-1/2)=-Ф(1/2)=-0,1915 P(11<x<14)=Ф(1)-(-Ф(1/2))=Ф(1)+Ф(1/2)=0,3413+0,1915=