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

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When two coins are tossed,the sample space is

$S=\{HH, HT, TH, TT\}$

Let $H$ be the number of tails that occur. The random variable $H$ takes values of $0,1,2.$

$P(H=0)=1/4$

$P(H=1)=2/4=1/2$

$P(H=2)=1/4$

$\def\arraystretch{1.5} \begin{array}{c:c} h & 0 & 1 & 2 \\ \hline p(h) & 1/4 & 1/2 & 1/4 \end{array}$