Check your blood pressure: In a recent study, the Centers for Disease Control and Prevention reported that diastolic blood pressures of adult women in the United States are approximately normally distributed with mean 80.2 and standard deviation 9.6. (a) Find the 20th percentile of the blood pressures,
(b) Find the first quartile of the blood pressures. Use the TI-84 Plus calculator and round the answers to at least two decimal places.
The 20th percentile of the blood pressures is