The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: 
In developing a histogram of these data,how many classes would be used?
Definitions:
Unresponsive
The state of not reacting or showing any response to stimuli or attempts at communication, often used in medical contexts.
Neuroadaptation
The process by which the brain undergoes changes to become more accustomed to new stimuli, often discussed in the context of drug tolerance and addiction.
Withdrawal
The discomfort and distress that follow discontinuing the use of an addictive drug.
Drug Addiction
A persistent, recurrent condition marked by an uncontrollable desire to seek drugs, ongoing consumption despite adverse effects, and enduring alterations to the brain's structure.
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