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The systolic blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg. The systolic blood pressure is normally distributed.
a.) The random variable x defines the systolic blood pressure of a person in China (True or False)
b.) What's the probability that a person in China has systolic blood pressure of 135 mmHg or more. (Round the answer to the nearest ten-thousandth, which is 4 places after decimal)
c.) What's the probability that a person in China has systolic blood pressure of 141 mmHg or less. (Round the answer to the nearest ten-thousandth, which is 4 places after decimal)
d.) What's the probability that a person in China has systolic blood pressure between 120 and 125 mmHg. (Round the answer to the nearest ten-thousandth, which is 4 places after decimal)
e.) What's the systolic pressure do 90% of all people in China have less than? (Round the answer to the nearest tenth, which is 1 places after decimal)
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