Diastolic Blood Pressure of Males Refer to Data Set 1 in Appendix B and use the diastolic blood pressures of males.

a. Find the mean and standard deviation, and verify that the data have a distribution that is roughly normal. Round the results using three decimal places.

b. Treating the unrounded values of the mean and standard deviation as parameters, and assuming that male diastolic blood pressures are normally distributed, find diastolic blood pressures separating the lowest 2.5% and the highest 2.5%. These values could be helpful when physicians try to determine whether diastolic blood pressures are significantly low or significantly high.