On a​ team, 3 girls and 2 boys scored a total of 8 points. The difference between the number of points scored by the 3 girls and the number of points scored by the 2 boys is 4. Each girl scored the same number of points and each boy scored the same number of points.

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.