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In a discount store, 12% of the 100 cups in stock have some unnoticeable defect. What is the probability of buying 12 cups that don’t have any defect? And what is the probability of getting all 12 cups having a defect?

 

I really need help

 Jun 8, 2018
 #1
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Probability of buying 12 cups that don't have any defect  is

 

88/100 * 87/99 * 86/98 * 85/97* 84/96 * 83/95 * 82/94 * 81/93 * 80/92 * 79/91 * 78/90 * 77/89  ≈

 

.1955   ≈  19.6%

 

 

Probability of buying all 12 of the defective cups  =

 

12/100 * 11/99 * 10/98 *  9/97 * 8/96 * 7/95 * 6/94 * 5/93 * 4/92 * 3/91 * 2/90 * 1/89  =

 

           1

__________________      ≈  [ very little chance!!!  ]

 1050421051106700

 

 

 

cool cool cool

 Jun 8, 2018

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