Find an approximation for the integral. 
Use a double Riemann sum with 
and the sample point in the upper right corner to
approximate the double integral, where 
.
Definitions:
Weighted Average Delay
implies the average time delay in a process or system, adjusted for the importance or frequency of each delay component.
Collection Delay
The time lapse between when a payment is made by a customer and when the funds become available to the recipient company.
Average Amount
The mean sum of a group of numbers, calculated by dividing the total by the quantity of numbers.
Weighted Average Float
The average time between when a check is deposited in a bank and when the funds are available.
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