Question

Tai chi exercise may reduce blood pressure (BP) and serve as a practical, nonpharmacological adjunct to conventional hypertension management. A geriatric psychologist is interested in studying nonpharmacological approaches for senior citizens struggling with prehypertension. Systolic blood pressure scores for senior citizens follow a normal distribution with μ 110 and σ 21. Use the Distributions tool to help answer the questions that follow. Note: To find the probability above or below a z-score, click on the normal curve icon with one line, and position the line at the appropriate z-score on the horizontal axis. The areas under the standard normal curve above and below the z-score will be displayed to the left and right of the vertical line, respectively. To find the probability between two z-scores, click on the normal curve icon with two lines, and position the left line at the lower z-score and the right line at the higher z-score. The area under the normal curve between the vertical lines will be displayed in blue. Standard Normal Distribution Mean0.0 Standard Deviation1.0 -3 -1 ДАЛ The highest possible z-score that is still in the lowest 80% of the systolic blood pressure distribution is

Answer 1

the highest possible z score that is .......is z =0.84

X =127.64

the score X is the 80th percentile of systolic.............

systolic blood pressure between 120 and 139 % =23.18%

systolic blood pressure below 91 =18.41%