25. Appendix B Data Set: Systolic Blood Pressure Refer to Data Set 1 in Appendix B and use the systolic blood pressure levels for males.

a. Using the systolic blood pressure levels for males, find the mean, standard deviation, and verify that the data have a distribution that is roughly normal.

b. Assuming that systolic blood pressure levels of males are normally distributed, find the 5th percentile and the 95th percentile. [Treat the statistics from part

(a) as if they were population parameters.] Such percentiles could be helpful when physicians try to determine whether blood pressure levels are too low or too high.

26. Appendix B Data Set: Systolic Blood Pressure Repeat Exercise 25 for females.

6-3 BEYOND THE BASICS