The probability that a visitor at the mall buys a pack of candy is 20%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?
Answers.
A) .343 B) .147 C) .189 D) .096 E) .027
One case is: candy - candy - no candy   The probability is 1/5*1/5*4/5 = 4/125   There are 3 such cases, so we should multiply this probability by 3.   P(exactly 2 buy candy) = 4/125 * 3 = 12/125= 
<gadget id="calculator">12/125</gadget>
<output>12/125 = around 0.096</output>
0.096   The answer is .096.
<result>D</result>
The probability that a visitor at the mall buys a pack of candy is 20%. If three visitors come to the mall today, what is the probability that exactly two will buy a pack of candy?