Question

If X is a random variable defined by the number of heads in three tosses of a coin, what would be the sample space?​

Answer 1

Let's use the letters H and T for “head” and “tail” respectively. The sample space:

$S = \begin{Bmatrix} TTT,TTH,THT,THH,HTT,HTH,HHT,HHH\end{Bmatrix}.$