A marketing firm claims that its ad campaign will increase sales for a fast-food chain by
15%. In a random sample of 25 stores, the average increase in sales was 16% with a
standard deviation of 5%.
What is the z value for the this example rounded to the nearest hundredth?

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?