SOLUTION: A box contains 10 flash drives. 5 flash drives are second hand and contain data. 2 flash drives a randomly chosen from the box. X is equal to 1 if atleast one of the flash drives c

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Question 1202007: A box contains 10 flash drives. 5 flash drives are second hand and contain data. 2 flash drives a randomly chosen from the box. X is equal to 1 if atleast one of the flash drives chosen already contains data, otherwise X is 0.
What distribution is this and what are the parameters?
Answer by ikleyn(52781) About Me  (Show Source):
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A box contains 10 flash drives. 5 flash drives are second hand and contain data.
2 flash drives a randomly chosen from the box. X is equal to 1
if at least one of the flash drives chosen already contains data, otherwise X is 0.
What distribution is this and what are the parameters?
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X = 0, if both selected flash drives are second hand. 

       The probability for it is  P(X=0) = %285%2F10%29%2A%284%2F9%29 = %281%2F2%29%2A%284%2F9%29 = 2%2F9.


Otherwise, X = 1 with the probability P(X=1) = 1 - 2%2F9 = 7%2F9.


It is the binomial distribution probability: n= 1 (the number of trials);

                                             p= 2%2F9 for X= 0  (successful trial) and  p= 7%2F9 for X= 1 (unsuccessful trial).

Solved.