Agrocery store gives away a $10 gift card to every 25th customer and a $20 gift card to every 60th customer. after the 300th customer receives both cards, what is the total amount in gift cards that the store has given away?

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.