The owner of an ice cream shop claims that 40% of his customers prefer chocolate ice cream, 35% prefer vanilla ice cream, 15% prefer strawberry ice cream, and 10% prefer mint ice cream. One of his employees wishes to test this claim. The employee randomly selects 100 customers and ask them about their preferred ice cream flavor. The following table shows the preferences of each of the 100 surveyed respondents. Assuming the requirements for the procedure have been met, which of the following procedures should the employee use to test the owner's claim about his customers' ice cream preferences?