Movie tickets are $8 for shows after 6 pm and $5.50 for shows before 6 pm. If 80 tickets are sold for a total of $575, which system of equations could be used to find the number of each type of ticket sold? * 1.x+y=8; 5.50x+80y=575
2.x+y=575; 5.50x+8y=80
3.x+y=80; 575x+8y=5.50
4.None of these
5.x+y=80; 5.50x+8y=575

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e. g. 98.7654). x f(x) 0 1 2 3