A foreign country uses the stellar as its currency. Before a trip to that country, Jon wants to exchange $1800 to stellars. Which of Bank A and Bank B has the better exchange rate? How many more stellars would he get if he exchanged his $1800 at the better exchange rate instead of at the other rate?

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.