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George flips an unfair coin 7 times. The coin has a 1/4 probability of coming up heads and a 3/4 probability of coming up tails. What is the probability that he flips exactly 2 tails?

HELP Please! Thanks

Creeperhissboom  Apr 15, 2018
edited by Creeperhissboom  Apr 15, 2018
 #1
avatar+87571 
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What are the probabilities of coming up  heads and talls???....they aren't showing up for me...

 

 

cool cool cool

CPhill  Apr 15, 2018
 #2
avatar+87571 
+1

P (two tails )   =  C(7,2) (3/4)^2(1/4)^5  =    189/16384  ≈ 1.15 %

 

 

cool cool cool

CPhill  Apr 16, 2018

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