The blood pressure (average of systolic and diastolic measurements) of each of 20 randomly selected persons was measured. the results were: 30, 38, 51, 32, 50, 23, 37, 24, 21, 67, 45, 47, 34, 36, 32, 29, 49, 55, 65, 41 construct a 95% confidence interval for the true mean blood pressure. what is the lower bound?

An air conditioning system can circulate 350 cubic feet of air per minute. how many cubic yards of air can it circulate per minute?

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 statement about the annual percentage rate (apr) is not true?