c=1/(2*pi)^.5;b=.25;a1=.5/.75^2;a2=.5;
b1=b*c; b2=(1-b)*c;
t=1:1:1000;
z1=b1./t; z2=b2./t;
t1=(1/(8*10.24)).*t;
t2=(1/(125*10.24)).*t;

u=-(log(t1)).^2; 
u1=a1.*u;
v=-(log(t2)).^2;
v1=a2.*v;
f1=z1.*exp(u1);
f2=z2.*exp(v1);
f=f1+f2;
plot(t,f)