Joe has two empty boxes, one box is 15 inches wide, 20 inches long and 10 inches high. the second box has the same length and width but is 4 inches taller. how much additional spaces is in the box

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?