[tomnyn]

clear
i=2;
w=0;
s=0;
e(i-1)=0;
f(i-1)=0;
x(i)=exprnd(10);
c(i)=x(i);
b(i)=x(i);
f(i)=x(i)*i;

while b(i)<480
y(i)=unifrnd(5,15);
e(i)=b(i)+y(i);
f(i)=b(i)*i+y(i)*i;
w=w+b(i)-c(i);
s=s+b(i)*i-c(i)*i;
i=i+1;
x(i)=exprnd(10);
c(i)=c(i-1)+x(i);
b(i)=max(c(i),e(i-1));
end
i=i-2;
l=s/w
m=i
排队问题求平均队长l?:ft: