5. Suppose the three most favorite kinds of food ordered at local McDonald’s stores were Big Mac, French Fries, and Chicken McNuggets. To focus on those 3 kinds of food, all the customers who ordered any single selections or combinations of the three selections were called the MFM segment. A staff with an MBA degree was called to do an analysis. She reported to the COO, “Based on our internal records, 43.6% of our MFM customers ordered Big Mac, 52% bought French Fries, and 30% ate Chicken McNuggets.” Proudly she continued, “My analysis shows that 1 out of 10 MFM customers ordered Big Mac and French Fries, 15.6% ordered Chicken McNuggets and French Fries. And, surprisingly, none had Big Mac and Chicken McNuggets together,” The COO then asked a question, “What is the percentage of MFM customers who ordered either French Fries or Chicken McNugget alone?” A correct answer by the staff should be________%(17%)
題目說明:                                                                                  解說：李柏堅
麥當勞有3種最受歡迎的食物 

     大麥克(Big Mac)                        薯條(French Fries )              麥克雞塊(McNuggets)

MFM segment:   無論單點或點以上的組合的客戶，稱之為"MFM segment"

針對"MFM segment"客戶研究

    P(大麥克)=0.436                         P(薯條)=0.52                           P(雞塊)=0.3

My analysis shows that 1 out of 10 MFM customers ordered Big Mac and French Fries, 15.6% ordered Chicken McNuggets and French Fries. And, surprisingly, none had Big Mac and Chicken McNuggets together
　

    P(大麥克∩薯條)=0.1               P(雞塊∩薯條)=0.156             P(大麥克∩雞塊)= 0

What is the percentage of MFM customers who ordered either French Fries or Chicken McNugget alone?” A correct answer by the staff should be________%

            P(單點薯條)= 0.52 - 0.156 - 0.1 = 0.264

            P(單點雞塊)= 0.3 - 0.156  =  0.144

            P(單點薯條U單點雞塊)=0.264 + 0.144 = 0.408 = 40.8%