A32 lb weight stretches a spring 2 ft in equilibrium. it is attached to a mass with a constant c 8 lb-sec/ft. the weight is initially displaced 8 inches below equilibrium and released from rest. find its displacement for t > 0.

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?