A pizza delivery service wants to track their delivery times.They take eight samples of four deliveries and record the following data.What are the upper and lower control limits of their R-chart? 
Definitions:
Markup on Cost
The percentage added to the cost of goods to cover overhead and profit, calculated by dividing the gross profit by the cost.
Net Sales
The amount of sales generated by a company after deducting returns, allowances for damaged or missing goods, and discounts.
Gross Profit
The financial metric representing the difference between revenue and the cost of goods sold before deducting overhead, payroll, taxation, and interest payments.
Inventory Value
The total cost or market value of all the goods and products held by a company intended for sale.
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