Answer to Question #5766 in Statistics and Probability for Alba McCarter
A survey of 100 people revealed that 45 read the wall street journal and 55 read Sports Illustrated and 12 read both. Find the probability that the person does not read Sports Illustrated
The conditions are inconsistent: if we have 100 people at all, 55 of them who read one journal and 45 of them who read another then we have 100-55-45=0 who read both.
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