Calls originate from Dryden according to a rate 12 Poisson process. 3/4 are local and 1/4 are long distance. Local calls last an average of ten minutes, while long distance calls last an average of five minutes. LetMbe the number of local calls and Nthe number of long distance calls in equilibrium. Find the distribution of(M,N). What is the number of people on the line.