Question 582819
Number of times the buyer saw the ad 1:: 2:: 3::: 4:::: 5
Probability:::::::::::::::::::::: 0.27 0.31 0.18 0.09 0.15 
What is the probability that the buyer saw the ad three or more times before purchasing?
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Ans: 0.18 + 0.09 + 0.15 = 0.42 
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Cheers,
Stan H.