Telephone Directory Riddle 

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Amazing Phone directory riddle

In Edinburgh, 15% of the population have unlisted phone numbers. If you selected 300 names at random from the town's phone directory, on average, how many of them would have unlisted phone numbers?

 

 

 

 

 

 

 

 


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The  Solution
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None. You will not find unlisted phone numbers in a phone directory.

 

 
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