Aproduction manager tests 10 batteries and finds that their mean lifetime is 468 hours. she then designs a sales package for this type of battery. it states that consumers can expect the battery to last approximately 500 hours. this is an example of what phase of inferential statistics?

Acollege is selling tickets for a winter fund-raiser. one day, krissa sold 14 adult tickets and 8 student tickets for a total of $376. the next day, she sold 7 adult tickets and 11 student tickets for a total of $272. krissa wanted to find the price of one adult ticket, a, and the price of one student ticket, s. she wrote and solved the following system of equations.