A patient is said to be hyperkalemic (high levels of potassium in the blood) if

Question

A patient is said to be hyperkalemic (high levels of potassium in the blood) if the measured level of potassium is 5.0 milliequivalents per liter (meq/L) or more. In a population of students at Ozark University, the distribution of potassium levels is normally distributed with mean 4.7 meq/L and standard deviation 0.4 meq/L. Estimate the proportion of students who are hyperkalemic. Round your answer to four decimal places. The proportion of students who are hyperkalemic is the tolerance is +/-2 percent

Explanation / Answer

Z = (x-mean)/sigma = (5-4.7)/0.4 = 0.75

We now need to find the probability than P(Z>z) from normal tables

P(z>0.75) is found from tables as 0.226627

Hence, the answer is 0.2266

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