Potassium blood levels in healthy humans are normally distributed with a mean of 17.0 mg/100 ml, and standard deviation of 1.0 mg/100 ml. Elevated
levels of potassium indicate an electrolyte balance problem, such as may be caused by Addison’s disease. However, a test for potassium level should not cause too many “false positives”. What level of potassium should we use so that only 2.5 % of healthy individuals are classified as “abnormally high”?
Use normal distribution