Find the number of full 8 hour shifts that Cleo worked last month. (1) She worked three times as many 8 hour shifts as 6 hour shifts.
(2) She worked a total of 180 hours.

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?