SOLUTION: 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

Question 1104449: 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
(b) the probability of late delivery in Washington, D.C
(c) the probability that two letters mailed in New York are both delivered on time
(d) the probability of on-time delivery nationwide
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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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