Check your blood pressure: In a recent study, the Centers for Disease Control and Prevention reported...

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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 80.4 and standard deviation 9.5. (a) Find the 20th percentile of the blood pressures. (b) Find the third quartile of the blood pressures. Use the TI-84 Plus calculator and round the answers to at least two decimal places. Part: 0 / 2 Part 1 of 2 The 20th percentile of the blood pressures is Tire lifetimes: The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean - 39 and standard deviation = 5. Use the TI-84 Plus calculator to answer the following. (a) What is the probability that a randomly chosen tire has a lifetime greater than 50 thousand miles? (b) What proportion of tires have lifetimes between 38 and 43 thousand miles? (c) What proportion of tires have lifetimes less than 47 thousand miles? Round the answers to at least four decimal places. Part: 0/3 Part 1 of 3 The probability that a randomly chosen tire has a lifetime greater than 50 thousand miles is 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 80.4 and standard deviation 9.5. (a) Find the 20th percentile of the blood pressures. (b) Find the third quartile of the blood pressures. Use the TI-84 Plus calculator and round the answers to at least two decimal places. Part: 0 / 2 Part 1 of 2 The 20th percentile of the blood pressures is Tire lifetimes: The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean - 39 and standard deviation = 5. Use the TI-84 Plus calculator to answer the following. (a) What is the probability that a randomly chosen tire has a lifetime greater than 50 thousand miles? (b) What proportion of tires have lifetimes between 38 and 43 thousand miles? (c) What proportion of tires have lifetimes less than 47 thousand miles? Round the answers to at least four decimal places. Part: 0/3 Part 1 of 3 The probability that a randomly chosen tire has a lifetime greater than 50 thousand miles is