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probability questions

Forums: Probability
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natanr123
 
Reply Sun 20 Apr, 2014 06:22 am
25 blocks arranged randomly in a circle: 15 red and 10 blue.
X is the Number of blue blocks that has red blocks on both sides.
What is the expected value of X?
What is the variance of X?
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Type: Question • Score: 0 • Views: 765 • Replies: 2
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markr
 
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Reply Tue 22 Apr, 2014 09:31 pm
@natanr123,
I get:
mean=3.804348
variance=2.672667
bobsal u1553115
 
  1  
Reply Tue 22 Apr, 2014 10:17 pm
@markr,
Winner winner, chicken dinner. choose a doll of the first shelf.
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