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B. 0.527
☐ D
C. 0.735
D. 0.923
At a mobile phone store, suppose that the probability that a phone is of good quality is 80% and the probability
that a phone is of poor quality is 20%. A customer gives a 5-star rating to a good phone with a probability of
90%, and to a poor phone with a prob-ability of 30%. Calculate the probability that a phone is good given that it
has received a 5-star rating.
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