There are 5 table tennis balls in the bag, 4 white and 1 yellow. Draw one out of them. Which of the following statements is incorrect is the probability of touching a yellow ball
袋中有5个乒乓球，其中白色4个，黄色1个．从中摸出一个，下列说法不正确的是摸到黄色球的可能性是多少
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>