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The systolic blood pressure of adults in the USA is nearly normally distributed with a mean...

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Statistics

The systolic blood pressure of adults in the USA is nearlynormally distributed with a mean of 119 millimeters of mercury(mmHg) and standard deviation of 25.

Someone qualifies as having Stage 2 high blood pressure iftheir systolic blood pressure is 160 or higher. Stage 1 high BP isspecified as systolic BP between 140 and 160.

Give your answers rounded to 4 decimal places.

a. What is the probability that an adult in the USA has stage2 high blood pressure?


b. What is the probability that an adult in the USA has stage1 high blood pressure?


c. Your doctor tells you you are in the 30th percentile forblood pressure among US adults. What is your systolic BP?
mmHg


d. What is the systolic blood pressure that cuts off the top2.5% of adults in the USA?
mmHg


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