high blood pressure, such as systolic blood pressure over 140 mmhg, is a risk factor for heart disease,. medical data indicates that the systolic blood pressure of all males aged 20 and over follows a normal distribution with mean 125 mmhg and standard deviation 15 mmhg. use the empirical rule to find the percentage of males ages 20 and over who have systolic blood pressure over 140 mmhg. make sure to answer all 3 parts below. a.) draw a normal distribution curve and shade the appropriate area under the curve. b.) use the empirical rule to find the percentage of males ages 20 and over who have systolic blood pressure over 140 mmhg. c.) interpret the results of your findings in a complete sentence within the context of the problem