More (and repeated) 3pt8 to 3pt10.docx - 3.59 An urn...

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3.59. An urn contains 5 White Chips, 4 Red Chips and 3 Blue Chips. We will now select 8 chips with replacement Let X count the number of Red Chips selected. Determine the following: a) ( 4) P X Our variable is how many successes. .
4 4 8! 4 8 (4!)(4!) 12 12      
3.60. An urn contains 5 White Chips, 4 Red Chips and 3 Blue Chips. We will now select chips, with replacement until we get a Blue Chip . Let X count the number of chips needed to end this experiment. Determine the following: a) ( 4) P X Our variable is how many trials. ,
3 1 3! 9 3 (3!)(0!) 12 12      
3.61. An urn contains 5 White Chips, 4 Red Chips and 3 Blue Chips. We will now select chips, with replacement until we get a Blue Chip. Determine the following: a) P(The first Blue Chip is selected on the third trial) Our variable is how many trials. ,

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