Acoffee shop mixes brazilian coffee worth $5 per kilogram with turkish coffee worth $8 per kilogram. the mixture is to sell for $7 per kilogram. how much of the turkish coffee should be used to make 300 kg of the mixture?

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?