Question: 2. A fair coin is tossed until either a tail occurs or a total of 4 tosses have been made, whichever comes rst. Let X

2. A fair coin is tossed until either a tail occurs or a total of 4 tosses have been made, whichever comes rst. Let X denote the number of tosses. :1) Build the probability distribution of X. b) Find the mean value of X. c) Find the standard deviation of X

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