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According to the WHO MONICA Project the mean systolic blood pressure f

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According to the WHO MONICA Project the mean systolic blood pressure
for people in China is 128 mmHg with a standard deviation of 23 mmHg (Kuulasmaa, Hense & Tolonen, 1998). Assume that systolic blood pressure is normally distributed.
a.) True or False: The random variable x defines the systolic blood pressure of a person in China
b.) Find the probability that a person in China has systolic blood pressure of 135 mmHg or more.
c.) Find the probability that a person in China has systolic blood pressure of 141 mmHg or less.
d.) Find the probability that a person in China has systolic blood pressure between 120 and 125 mmHg.
e.) What systolic blood pressure do 90% of all people in China have less than?

 
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