Dear co-listers. I have been reviewing some basic probability exercises and
I found one that maybe was solved in a wrong way in a textbook. I decided
to ask to the list in order to confirm my suspicion.
The Ministry of Health analyzed water holes in a country to detect 2 types
of impurities that commonly are found in potable water (A and B). 20% of
them didn’t have any impurities, 40% have impurity A and 50% impurity B
(some of them have the two types). Determine the probability distribution of
Y, the quantity of impurities that have a water hole randomly chosen.
The answer from the book are (0=0.2, 1=0.7 and 2=0.1)
Thanks
By the way, any of you know if there is available a teacher’s book with
answers for exercises of the book called Mathematical Statistics with
applications (Sixth edition) from Dennis D. Wackerly, William Mendenhall
III and Richard L. Scheaffer? (Thomson editiorial)
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Rodrigo Briceño
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