Question

In a survey, 70 out of 84 people from the north prefer professional football over college football. 120 people from the south were asked the same question. In order for favorite type of football and region to be independent, how many people in the south would have to prefer professional football

Answer 1

Answer: 100 people

Explanation:

So if we know that 70 out of 80 prefer pro football in ht north then we could set up a proportion to solve how many will prefer pro football in the south over the total of 120.

`(70)/(84) = (x)/(120)` =?

84x = 8400

x= 100

Now we could say that a 100 people has to prefer professional football .

Answer 2

100 =x

Explanation:

We want the same ratio

70 x

----- = ---------

84 120

Using cross products

70*120 = 84x

Divide each side by 84

70*120/84 = x

100 =x