document.write( "Question 1159301: Four machines are in operation. Machine 1 produces five percent defective items,
\n" ); document.write( "machine 2 three percent, machine 3 four percent, and machine 4 eight percent. A machine
\n" ); document.write( "is selected at random and an item picked.
\n" ); document.write( "a. Given that the item is defective, find the probability that it came from machine 2.
\n" ); document.write( "b. Given that the item is defective, find the probability that it didn’t come from machine 2.
\n" ); document.write( "c. Given that the item is not defective, what is the probability that it is from machine 2?
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Algebra.Com's Answer #782636 by Boreal(15235)\"\" \"About 
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Look at 1000 from each machine\r
\n" ); document.write( "\n" ); document.write( "====Def======ND===Total
\n" ); document.write( "1-----50 ----- 950---- 1000
\n" ); document.write( "2---- 30---------970-----1000
\n" ); document.write( "3-----40--------960----1000
\n" ); document.write( "4-----80--------920----1000
\n" ); document.write( "tot--200--------3800---4000\r
\n" ); document.write( "\n" ); document.write( "If defective (200) probability it came from machine 2 is 30/200 or 0.15
\n" ); document.write( "The probability it did not come from machine 2 is 0.85, the complement
\n" ); document.write( "If it is not defective (3800) the probability it was from machine 2 is 970/3800 or 0.255.
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