Adult tickets to a play cost $22. tickets for children cost $15. tickets for a group of 11 people cost a total of $228. write and solve a system of equations to find how many children and how many adults were in the group. 40 !

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?