What is the percentage chance of pulling the black marble from the bag?

You have a bag of 100 marbles – 5 are black, 95 are red.. What is the percentage chance of pulling the black marble from the bag? If you put the marble back after every try, what are the chances of pulling a black marble after 20 tries? Show the forumla you are using to figure this out.. This is not a school problem..

5% for the initial try, 64.1514078% for the 20 tries.

1. 5/100=0.05=5%
2. 1-(0.95^20)=0.641514078= 64.1514078%

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