Example 3.1.1 Tossing a Coin. Consider an experiment in which a coin is tossed 10 times. In this experiment the sample space can be regarded as the set of outcomes consisting of the different sequences of 10 heads and tails that are possible, and the random variable X could be the number of heads obtained on the 10 tosses. For each possible sequence s consisting of 10 heads and tails, this random variable would then assign a number X (s)