A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40. Use the histogram to answer the question. The blood pressure readings were given to the nearest whole number. 
-What common class width was used to construct the frequency distribution?
Definitions:
Obsessive-Compulsive Disorder
A mental health disorder characterized by persistent, unwanted thoughts (obsessions) and repetitive behaviors (compulsions) that one feels driven to perform.
Psychotherapy
A therapeutic treatment method used by trained professionals to help individuals understand and resolve their problems by talking through them.
Behavioral Therapeutic Technique
A range of treatments based on the principles of behaviorism and cognitive psychology, aimed at changing maladaptive or unwanted behaviors.
Biological Treatment
Treatments that address psychiatric disorders or diseases through physical interventions, such as medications or surgery.
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