Pick any number from the 9 numbers from 1 to 9, what is the probability that the number taken out is an even number?
从1-9共9个数字中任取一个数字，则取出的数字为偶数的可能性为多少
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>