Adiver went down 25.55 feet below the surface of the ocean and then 19.5 feet the fruther down he then rose 12.75 feet and solve an expression to find to divers new depth. what's the divers new depth feet below the surface?

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?