Put 8 red pencils and 2 blue pencils in a bag, let you touch it once each time, and put it back after you touch it. After touching it 20 times, what is the probability of finding a blue pencil?
把8支红铅笔和2支蓝笔放在一个包里，让你每次往里摸一次，摸后放回，这样摸了20次，摸出蓝铅笔的可能性为多少．
<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>