If an M/M/1 queue in a server has task arrivals at a rate of 30 per second and serves at a rate of 50 per second, how many tasks are in the system (waiting and being served) on average?

When creating a budget, log fixed expenses before income. after income. after savings. at the top.

Why were most movies from the late 1890s until the early 1930s only filmed in black and white? there were only a few people who could afford the technology to produce color motion pictures back then. audiences did not want color motion pictures until later. the film used to make color motion pictures often overheated, which was a safety hazard, so it was generally not allowed. color films had to be hand-colored, frame by frame.

Effective character encoding requires standardized code. compatible browsers. common languages. identical operating systems.