Player A $($the row player$)$ has moves $p,q,$ and Player B $($the column player$)$ has moves $a,b.$ Player A decides to

play $p50\%$ of the time and $q50\%$ of the time. Player B decides to pick $a30\%$ of the time and $b70\%$ of the time.

$($i$)$ State the meaning of $P_{1,1}$ in this game.