SOLUTION: In an effort to check the quality of their cell phones, a manufacturing manager decides to take a random sample of 10 cell phones from yesterday�s production run of 2000 phones. I

Question 618748: In an effort to check the quality of their cell phones, a manufacturing manager decides to take a random sample of 10 cell phones from yesterday�s production run of 2000 phones. If each of the 2000 phones is likely to be selected:
i)What is the probability that a randomly selected cell phone will be one of the last 80 produced?
ii)What is the probability that the first cell phone selected is either from the last 160 produced or from the first 90 to be produced?
iii)What is the probability that the first two cell phones are both from the last 80 produced?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
In an effort to check the quality of their cell phones, a manufacturing manager decides to take a random sample of 10 cell phones from yesterday�s production run of 2000 phones. If each of the 2000 phones is likely to be selected:
i)What is the probability that a randomly selected cell phone will be one of the last 80 produced?
Ans: 80/2000 = 8/200 = 1/25
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ii)What is the probability that the first cell phone selected is either from the last 160 produced or from the first 90 to be produced?
Ans: (160 + 90)/2000 = 250/2000 = 1/8
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iii)What is the probability that the first two cell phones are both from the last 80 produced?
P(1st 2 from last 80) = (1/25)(1/25) = 1/625
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Cheers,
Stan H.
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