If the following jobs are sequenced according to the first-come-first-served (FCFS) rule then the mean completion time in days for all jobs is (assume zero for today's date) 
Definitions:
Product Costing System
A product costing system determines the cost to manufacture a product, taking into account direct materials, direct labour, and overhead expenses, essential for pricing and profitability analysis.
Manufacturing Overhead Account
This refers to the ledger account that records all indirect factory-related costs incurred during a production period that are not directly tied to a specific product.
Overapplied
A condition where the allocated indirect costs exceed the actual indirect costs incurred.
Underapplied
A situation where the allocated or applied costs are less than the actual costs incurred, leading to a cost discrepancy.
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