Probability distributions
 

Probability distributions problem 2


Rachel has three coins. The first coin is biased so that the probability of obtaining a head when it is thrown is . The second coin is biased so that the probability of obtaining a head when it is thrown is . The third coin is fair. Rachel throws the three coins at the same time. The random variable X is the number of tails that she obtains. Draw up the probability distribution table for X.


 

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