According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg. Assume that blood pressure is normally distributed.
Round the probabilities to four decimal places.
It is possible with rounding for a probability to be 0.0000.
a) State the random variable.
Select an answer rv X = a randomly selected person in China rv X = the mean blood pressure of a sample of people in China rv X = the mean blood pressure of all people in China rv X = blood pressure is normally distributed rv X = the blood pressure of a randomly selected person in China
b) Find the probability that a randomly selected person in China has a blood pressure of 83.8 mmHg or more.
c) Find the probability that a randomly selected person in China has a blood pressure of 113.4 mmHg or less.
d) Find the probability that a randomly selected person in China has a blood pressure between 83.8 and 113.4 mmHg.
e) Find the probability that randomly selected person in China has a blood pressure that is at most 70.5 mmHg.
f) Is a blood pressure of 70.5 mmHg unusually low for a randomly selected person in China?
Why or why not?
Select an answer yes, since the probability of having a value of blood pressure at least that high is less than or equal to 0.05 yes, since the probability of having a value of blood pressure at the most that value is less than or equal to 0.05 no, since the probability of having a value of blood pressure at least that high is less than or equal to 0.05 no, since the probability of having a value of blood pressure at the most that value is less than or equal to 0.05 yes, since the probability of having a value of blood pressure at least that high is greater than 0.05 yes, since the probability of having a value of blood pressure at the most that value is greater than 0.05 no, since the probability of having a value of blood pressure at least that high is greater than 0.05 no, since the probability of having a value of blood pressure at the most that value is greater than 0.05
g) What blood pressure do 78% of all people in China have less than?
Round your answer to two decimal places in the first box.
Put the correct units in the second box.