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I'm so bad at probability lol

 
RainbowPanda  Apr 13, 2018
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 #1
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We have  21  marbles...we are drawing with replacement

 

P(red, red )  =  6/21 * 6/21  =  2/7 * 2/7  =   4/49    true  

P (blue, yellow)  = 4/21 * 9/21  =  4/21 * 3/7 = 4/49 false

P (yellow, red )  =  9/21 * 6/21  =  3/7 * 2/7  =  6/49 false

P(green, green )  = 2/21 * 2/21     =  4/441  false

P (yellow, green )  =  9/21 * 2/21  =  3/7 * 2/21  =  6/147  = 2/49  true

P (red, blue )  = 6/21 * 4/21  =  2/7 * 4/21  =  8 / 147  true

 

BTW.....we don't have an "amount" of marbles....we only have a "number" of marbles  !!!!

 

Second  one

 

P (G/ S)  =     P(S and G) / P(S)  =  .32 / .50   =  .64   = 64%

 

 

cool cool cool

 
CPhill  Apr 13, 2018

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