In an all boys school, the heights of the student body are normally distributed with a mean of 67 inches and a standard deviation of 2 inches. Using the empirical rule, what percentage of the boys are between 65 and 69 inches tall?

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?