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:
Shareholder Manager
A shareholder who also plays a direct role in the management of a company.
Passive Shareholder
An investor who holds a stake in a company but does not take part in day-to-day management or operational decisions.
Authorized Shares
Shares that a corporation is empowered to issue by its articles of incorporation.
Preference Shares
A class of stock that provides shareholders with priority over common shareholders in terms of dividends and assets in the event of liquidation.
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