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probability

The acidity of human blood is measured on a pH scale and is a  normal random variable. The mean pH of blood is 7.2 with a standard deviation of 0.15. Find the probability that random selected person would have a blood pH greater than 7.17.
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1 Answer

First find the number of standard deviations:
(7.17-7.2)/.15=-.2
 
Then use excel to find the percentage of a normal distribution -.2 std dev's below average:
=normsdist(-.2)=.4207
 
Hope that helps,
Deanna