If a coin is tossed 15 times and 9 times are heads and 6 times are tails, what is the probability that the 16th coin toss will be heads?
投掷15次硬币，有9次正面向上，6次反面向上，那么投掷第16次硬币，正面向上的可能性是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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