A store is giving out cards labeled 1 through 10 when customers enter the store. If the card is an even number, you get a 10% discount on your purchase that day. If the card is an odd number greater than 6, you get a 30% discount. Otherwise, you get a 20% discount. The table shows the results of 500 customers. What is the relative frequency for each discount? Use a pencil and paper. If the manager of the store wants approximately half of the customers to receive the 20% discount, does this seem like an appropriate method? Explain.