The total cholesterol readings for 40 female patients seen this week at a doctor's office were recorded. Figure is a histogram of these data. Use the following figure.Total cholesterol readings lower than 200 are considered normal. How many patients had readings lower than 200? 
Definitions:
Concrete Operations
A stage in Piaget's theory of cognitive development where children gain the ability to think logically about physical objects and events.
Sensorimotor
Pertaining to the development phase where an infant's understanding of the world is based on sensory experiences and the motor actions they perform.
Preoperational
A developmental stage in Piaget's theory of cognitive development, roughly ages 2 to 7, characterized by symbolic thought and egocentrism, but a lack of logical operations.
Cognitive Development
The study of how thinking, problem-solving, and intelligence evolve as individuals grow, often focusing on childhood development.
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