The first coffee shop has four different cup sizes (8 oz, 10 oz, 12 oz, and 14 oz). Each customer has to order one of those sizes. After each customer orders a drink, the person behind the counter fills the cup and then gives it to the customer.

The second coffee shop has four different cup sizes (9 oz, 10 oz, 11 oz, and 12 oz). Each customer has to order one of those sizes. After each customer orders a drink, the person behind the counter fills the cup and then gives it to the customer.

The third coffee shop has four different cup sizes (8 oz, 8.5 oz, 9 oz, and 9.5 oz). Each customer has to order one of those sizes. After each customer orders a drink, the person behind the counter fills the cup and then gives it to the customer.

The fourth coffee shop gives each customer a 16 ounce cup and allows the customer to fill the cup to whatever point he or she likes. The customer chooses when to stop filling the cup. After the customer fills in the cup, the person at the counter measures the number of ounces inside of the cup, and then charges the customer for that number of ounces.

Write a short paragraph that answers the following two questions and explains your thinking. (Content is more important than length for this question)

At which of the coffee shops is "number of ounces purchased" a discrete a variable? (it could be one of them or more than one of them)

At which of the coffee shops is "number of ounces purchased" a continuous variable? (it could be one of them or more than one of them)