document.write( "Question 485447: Three ball bearings are drawn at random from a lot of 500 ball bearings , 10 of which are defective. Find the probability that the ball bearings drawn will be nondefective in drawing (a) with replacement, (b) without replacement. \n" ); document.write( "
Algebra.Com's Answer #332024 by Edwin McCravy(20059)\"\" \"About 
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document.write( "Probability that all will be nondefective is\r
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document.write( "P(1st is nondefective)×P(2nd is nondefective)×P(3rd is nondefective)\r
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document.write( "(a) with replacement.  The probabilities do not change:\r
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document.write( "P(1st is nondefective)×P(2nd is nondefective)×P(3rd is nondefective) =\r
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document.write( "(b) without replacement.  The probabilities do change:\r
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document.write( "P(1st is nondefective)×P(2nd is nondefective)×P(3rd is nondefective) =\r
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document.write( "So there is very little difference between the probabilies.\r
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document.write( "Edwin>/pre>
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