Simplify the following text for a Grade 7 native English-speaking person.
Original: Only 13 % of the population is proficient in these three areasâ '' able to compare viewpoints in two editorials ; interpret a table about blood pressure , age , and physical activity ; or compute and compare the cost per ounce of food items .
Simplified: They can interpret a table about blood pressure , age , and physical activity . They can also compute and compare the cost per ounce of food items .