The acidity of human...

Question

The acidity of human blood measured on a pH scale and its normal random variable. The mean is 7.2; standard deviation is 0.15. Find the probability that a random person has pH greater than 7.23.

Answer 1

It probably can be done in this way:

 

Z= (X- μ)/σ = (7.23-7.2)/0.15 = 0.2

 

From z table, we can get the p value 0.4207.

 

So the probablity is 42.07%.