Question 1157711
Probability EXACTLY ONE has the side effect:
{{{(0.1)^1 * (0.9)^11 * (12!/(1!*11!))}}} = 0.1 * 0.3138 * 12 = 0.3766
<pr>
Probability NONE have the side effect:
{{{(0.9)^12}}} = 0.2824
<pr>
Probability FEWER THAN TWO have the side effect: 0.3766 + 0.2824 = <b>0.6590</b>