A snack bar cooks and sells x number of hamburgers and y number of hot dogs during football games. To stay in business, it must sell at least 10
hamburgers but cannot cook more than 40. It must also sell at least 30 hot
dogs, but cannot cook more than 70. The snack bar cannot cook more than 90
items total.

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.