Final answer:
Miguel's Taqueria served appetizers to a greater percentage of customers (91%) compared to Pho House (70%).
Step-by-step explanation:
To determine which restaurant served appetizers to a greater percentage of customers, we need to compare the percentages directly. At Miguel's Taqueria, 91% of the customers ordered appetizers. On the other hand, at Pho House, 7/10 (which is equal to 70%) of the customers ordered appetizers. Since 91% is greater than 70%, Miguel's Taqueria served appetizers to a greater percentage of its customers than Pho House did.