Stats 141 Probability.docx

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9 Nov 2012
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Stats 141
Example:
There are six socks in a drawer. Two are yellow, two are green, and two are purple. If two socks
are drawn at random (socks are not replaced), what is the probability that...?
A.) Both are yellow
P(Sock 1 yellow and Sock 2 yellow)
   
B.) Both same colour
P(Sock 1 and Sock 2 same colour)
  
 
C.) First is yellow and the second is not yellow
P(First sock yellow and second sock not yellow)
  
   
Example 2:
Same information as Example 1 but with replacement.
A.) Both yellow
P(Both yellow)
  
   
B.) Both same colour
P(Sock 1 and sock 2 are same colour)
 
   
C.) First is yellow and the second is not yellow
P(First yellow and second not yellow)
  
   
Example 3:
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