Frank is a location analyst for a fast$-$food restaurant chain. He knows that previous restaurants have been placed in locations where most people within a three$-$mile radius have the following characteristics: household incomes between $$50,000$ and $$65,000$ per year, children and parents highly engaged in after$-$school activities, family valued above work, and one or both parents having some education beyond high school. His target audience likely falls into the $\_\_\_\_\_\_\_\_$ level of social class, which includes about $70$ percent of people in the United States