The statistics professor has kept attendance records and recorded the number of absent students per class.The recorded data is displayed in the following histogram with the frequency of each number of absent students shown above the bars. 
How many statistics classes had three or more students absent?
Definitions:
Fear
An unpleasant emotion caused by the belief that someone or something is dangerous, likely to cause pain, or a threat.
Panic Disorder
An anxiety disorder characterized by sudden and unprovoked panic attacks.
Hyperventilation
A condition of breathing at an abnormally rapid rate, leading to a decrease in the carbon dioxide levels in the blood, which can result in symptoms such as dizziness or tingling in the limbs.
Panic Disorder
A psychiatric disorder characterized by unexpected and repeated episodes of intense fear accompanied by physical symptoms.
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