One of the required properties of a probability distribution function for a discrete random variable X is that 
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Definitions:
Activity Variance
The difference between planned activity levels and actual activity levels in budgeting and accounting.
Selling And Administrative Expenses
Costs related to selling products and managing the business, not directly tied to production.
Budgeting
The process of creating a financial plan or forecast for a specific period, detailing expected revenues and expenditures.
Employee Salaries
Fixed payments made to employees for their services over a specified period, typically monthly or bi-monthly.
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