The relative frequency table below shows the closing share price changes for the 100 most actively traded NASDAQ stocks yesterday.Use the grouped data table to approximate the variance for the data represented. 
Definitions:
Ronald Melzack
A Canadian psychologist known for co-developing the Gate Control Theory of pain, which revolutionized understanding of pain mechanisms.
Pain Questionnaire
A tool designed to assess and quantify the intensity, location, and nature of a patient's pain experience.
Health Psychologists
Experts dedicated to examining the impact of biological, psychological, and social elements on health and disease.
Pain Therapy Programs
Specialized healthcare interventions designed to manage and alleviate pain through various techniques, including medication, physical therapy, and psychological support.
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