Suppose that the signal is sampled at random instants of time. (a) find the long-term sample mean. (b) find the long-term relative frequency of the events ""voltage is positive""; ""voltage is less than "" (c) do the answers to parts a and b change if the sampling times are periodic and taken every seconds?

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?