function [] = chap_9_prob_2()
% 
% Written by:
% -- 
% John L. Weatherwax                2007-04-02
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

lambda = 3; 
s = [ 2, 5, 10, 20 ]/60; % <- now in minutes ... the same units as lambda
poisspdf( 1, s*lambda )