You are choosing between 3 phone plans, Utalk, myfone and Hello. The rates are as follows: Utalk - phone rental 16.50 with 9 cents a minute 52.5 Myfone - $12.99 with 10 cents a minute 52.99 Hello - $18.75 with 6 cents a minute. 42.75 This is the best plan You used 400 minutes in September. Find the bill for each phone plan and determine which plan is best for you.

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?