There is a table tennis ball in the lottery box, marked with numbers 1-10, if you touch one randomly, what is the probability of getting an odd number ball?
抽奖箱中有个乒乓球，分别标着1-10个数字，任意摸一个，摸到单数球的可能性是多少．
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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