SOLUTION: In a large city, the proportion of households having a dog is 0.4. The proportion of households having a cat is 0.3. The proportion of households having both a dog and a cat is 0.1

Question 995549: In a large city, the proportion of households having a dog is 0.4. The proportion of households having a cat is 0.3. The proportion of households having both a dog and a cat is 0.15. What proportion of households has a dog or a cat?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In a large city, the proportion of households having a dog is 0.4. The proportion of households having a cat is 0.3. The proportion of households having both a dog and a cat is 0.15. What proportion of households has a dog or a cat?
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P(D or C) = P(D)+P(C)-P(D and C)
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Ans: P(Dor or cat) = 0.4 + 0.3 - 0.15 = 0.55
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Cheers,
Stan H.
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