A CFO is looking at how much the company is spending on computing.He samples companies in the pharmaceutical industry and develops the following stem-and-leaf graph. 
If you were creating a frequency histogram using these data,how many classes would you create?
Definitions:
Serotonin Activity
The biochemical actions and reactions related to serotonin, a neurotransmitter that plays a key role in mood regulation, appetite, and sleep among other functions.
Biofeedback
A technique that teaches individuals to improve their health by controlling certain bodily processes that normally happen involuntarily, such as heart rate or blood pressure.
Depression
A mental health condition marked by persistent feelings of sadness, loss, or anger, affecting one's daily functioning.
Biofeedback
A technique that teaches individuals to control physiological processes, such as heart rate or muscle tension, by providing real-time feedback.
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