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..
2007-03-18 15:35:25 · 4 answers · asked by captainevers 2 in Education & Reference ➔ Other - Education
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%
2007-03-18 15:38:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
chances are 50/50 either you will or you won't.
seriously though, if there are 5 black 95 red, the chances are 5%. If you put the marble back each time, it stays the same.
2007-03-18 15:44:03 · answer #2 · answered by YE_ 2 · 1⤊ 0⤋
5% chance 5 times out of 100 you will choose black so if you try 20 times then you will probably get it 1 time you multiply 20 by .05 and get 1!!!!!!!!!!
2007-03-18 15:41:00 · answer #3 · answered by juicyjunebug14 2 · 0⤊ 1⤋
5%, OUT OF EVERY 20 MARBLES THERE IS ONE BLACK MARBLE. ON AVERAGE ONE ATTEMPT OUT OF EVERY 20 WOULD YIELD A BLACK MARBLE.
GOD BLESS
2007-03-18 15:39:48 · answer #4 · answered by thewindowman 6 · 0⤊ 0⤋