Xiao Ming plays the game of tossing a coin. He has tossed a coin 8 times, 3 of which are heads and 5 are tails. What is the probability of the 9th toss of heads?
小明玩掷硬币的游戏，共掷了8次，其中3次正面，5次反面，第9次掷正面的可能性是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>