<PRE><B>Question 272951</B>
A postal carrier distributes letters, ads, and magazines. The break down of deliveries is:

Delivered to  / Letter  /  Ads  / Magazines  /Total
Homes         /775      / 880   /270         /1925
Business      /485      /417    /180         /1082
Total         /1260     /1297   /450         /3007
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Questions
A What is the probability that it was an ad? = 1297/3007
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B What is the probability that it was an ad delivered to a home? = 880/3007
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C What is the probability that it was an ad or it was delivered to a home?
= P(ad)+P(home)-P(ad and home) = (1297+1925-880)/3007 = 2342/3007
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Cheers,
Stan H.</PRE>