Question

Two coins are tossed.let H be the the number of tails that occur.determine the values of the random variable H

Answer 1

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

$S = \begin{Bmatrix} hh, ht, th, tt\end{Bmatrix}.$

In the case of hh (i.e we got two heads) H = 0; for ht and th (first head, second tail or vice versa) H = 1 and for tt (both tails) H = 2.