image of table: http://i.imgur.com/859hbd0.png
A shoe company wants to gauge opinions of a new shoe design. They send out 100 pairs to people in four different cities, but because of cost constraints they can interview only 40 people total.

They randomly choose 10 people from each city to interview. The table shows how many people in each city rated the shoe "positive" in each of three categories.

Using the sample results, estimate the proportion of the entire population that would like the color of the shoe.
A) 0.29
B) 0.4
C) 0.625
D) 0.725

Question

image of table: http://i.imgur.com/859hbd0.png
A shoe company wants to gauge opinions of a new shoe design. They send out 100 pairs to people in four different cities, but because of cost constraints they can interview only 40 people total. 

They randomly choose 10 people from each city to interview. The table shows how many people in each city rated the shoe "positive" in each of three categories.

Using the sample results, estimate the proportion of the entire population that would like the color of the shoe.
A)	0.29	
B)	0.4	
C)	0.625	
D)	0.725