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The pH measurements of water specimens from various locations along a given river basin are Normally distributed with mean 8 and standard deviation 0.3. Reference:

The pH measurements of water specimens from various locations along a given river basin are Normally distributed with mean 8 and standard deviation 0.3.

Reference: Ref 11-1

What is, approximately, the probability that the pH measurement of a randomly selected water specimen is a value between 7.5 and 8.2?

0.3003 0.6997 0.9522 0.9902

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