The chorus at eastside high school is holding a fund-raiser. the goal is to raise $500. the graph shows the number of short sleeve and long sleeve t-shirts the chorus needs to sell in order to raise $500.
if they sold only short sleeve t-shirts and raised exactly $500, how many shirts did they sell?
a)15
b) 20
c) 25
d) 50

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.