Hi I just need help on b thank you ASAP

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?

Landon wrote that 3−2.6=4. which statement about his answer is true?

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.