Xiao Ming is going to toss a coin 5 times, and the first 4 times are all heads, so what is the probability of the 5th toss of the coin being tails?
小明准备掷5次硬币，前4次都是正面朝上，那么掷第5次硬币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>