SOLUTION: On the colorimetric analysis to detect the presence of nitrates
in the water of the lakes, we know that if a sample contains nitrate
When pouring a certain solution into the wate
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Question 1134892: On the colorimetric analysis to detect the presence of nitrates
in the water of the lakes, we know that if a sample contains nitrate
When pouring a certain solution into the water, it turns red on
95% of the time When you pour that solution into samples of
water that does not contain nitrates, the water turns red 10% of the
times (as a consequence of the presence of other chemicals that are
present and also react with the agent). Past experience
in a laboratory indicates that 30% of the water samples that are sent
to analyze contain nitrates.
a) If a sample of water samples sent to the laboratory is chosen, a
randomly, what is the probability that it will turn red
when analyzed?
b) If a water sample is chosen randomly and turns red
when analyzing, what is the probability that actually
contain nitrates?
Answer by Glaviolette(140) (Show Source): You can put this solution on YOUR website!
I set up a tree diagram and then calculated the probabilities.
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