Please I need help with this ….the b part of the question

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?

Which graph or graphs appear to show a sinusoid? < me asap !

3/8 of the students in ms. mull’s class ride the bus. if there are 24 students in the class, how many students ride the bus?