If someone flips a coin 10 times and gets heads 7 times and tails 3 times, what is the probability of tails on the 11th toss?
某人掷10次硬币，有7次正面朝上，3次反面朝上，那么掷第11次时反面朝上的可能性是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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