bag contains black and white balls, numbered 1 to 4 are black balls, and numbers 5 to 9 are white balls. Randomly draw a ball from the bag, what is the probability of drawing a white ball ((())/(())).
一个袋子里装有黑白两种颜色的球，1号到4号是黑球，5号到9号是白球．从袋子中任意摸出一个球，摸到白球的可能性是((())/(()))多少．
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>