<PRE><B>Question 1104449</B>
The Los Angeles Times reported that the U.S. Postal Service is getting speedier, with higher overnight on-time delivery rates than in the past. The Price Waterhouse accounting firm conducted an independent audit by seeding the mail with letters and recording ontime delivery rates for these letters. Suppose that the results were as follows (these numbers are fictitious but are compatible with summary values given in the article). Use the given information to estimate some probabilities. 
        Number of Letters Mailed	Number of Letters Arriving on Time
Los Angeles        500                              430
New York           500                              410
Washington, D.C.   500                              405
Nationwide        6000	                           5160
(a) the probability of an on-time delivery in Los Angeles:: 430/500 

(b) the probability of late delivery in Washington, D.C::(500-405)/500 = 95/500 

(c) the probability that two letters mailed in New York are both delivered on time:: (410/500)^2 

(d) the probability of on-time delivery nationwide:: 5160/6000 
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Cheers,
Stan H.
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