ABSTRACT
The time, • X, between successive arrivals is exponentially distributed, with a cumulative distribution function, F(x), given by
{ }( ) Pr 1 (0 )xF x X x e x−= ≤ = − ≤ < ∞l (6.1) and a probability density function, f(x), given by
( ) ( ) (0 ) xf x F x e x−= = ≤ < ∞′ ll (6.2)
and with a mean, 1
[ ]E X = l
, and a variance, 2 1
[ ]Var X = l
.