A CFO is looking at what percentage of a company's resources are spent on computing. He samples companies in the pharmaceutical industry and develops the following stem-and-leaf display (leaf unit = 0.1) . 
What would be the class length used in creating a frequency histogram?
Definitions:
Salary Contribution
The portion of an individual's salary that is allocated towards investment, savings, or retirement plans, often in a structured or mandated manner.
403b Plan
A tax-advantaged retirement savings plan available to employees of educational institutions and certain non-profit organizations.
Salary Reduction
A decrease in the amount of an employee's pay before taxes as agreed upon by the employer and employee, often in exchange for some benefit such as enhanced retirement contributions.
Tax Bracket
Categories that determine the rate at which income is taxed based on income levels.
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