1. Let's denote H - heads, T - tails.
There are 22=4 possible outcomes
S={HH,HT,TH,TT} The possible values of the random variable Y are 0,1,2.
Possible OutcomesHHHTTHTTY0112
We will assume that the probability of getting heads and tails is the same:
p=q=1/2
Construct the probability distribution of the random variable
yp(y)01/411/221/4 or
yp(y)00.2510.520.25
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