Statistics homework problem

Posted on 2014-03-18 09:35:00 in Statistics by BEENA P

A health study reported that, in one country, systolic blood pressure readings have a mean of 118 and a standard deviation of 14. A reading above 140 is considered to be high blood pressure.



a. What is the z score of a blood pressure reading of 140?

b. If systolic blood pressure in that country has a normal distribution, what proportion of the population suffers from high blood pressure?

c.What proportion of the population has systolic blood pressure in the range from 103 to 140?

d. Find the 90th percentile of blood pressure readings

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