Abstract
The truncated normal distribution arises naturally in the performance analysis of computer and communication systems. It is shown that exact solutions for queueing models involving the truncated normal distribution may be obtained if a rational approximation for the Laplace transform of the truncated normal may be derived. It is then demonstrated how such an approximation may be obtained using the Padae approximation method. The reliability of the process is illustrated by applying the method to compute the average number of jobs in the special case of the E2/TN/1 model.