A three-digit number is composed of 2, 0, and 9. Xiao Ming first guesses the number in the hundreds place. What is the probability of guessing correctly?
一个三位数是由2、0、9三个数字组成的，小明首先猜百位上的数字，猜中的可能性是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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