We need to find total number of shoppers.
That is all the cells of the tables added together.
Thus,
Total Number of shoppers = 15 + 105 + 37 + 20 + 53 + 7 + 13 + 67 + 73 + 1 + 3 + 13 + 42 + 51 = 500
Now, we need the total number of shoppers at Sears [both female and male]. We add the Column of Sears:
Total Number of Sears Shoppers = 53 + 13 = 66
So, the probability of selecting a shopper who prefer to shop at Sears is:
66/500
In decimal,
0.132
In percentage,
0.132 * 100 = 13.2%
Answer:13.20%