If the following jobs are sequenced according to the SPT rule,then the mean tardiness (in days) for all jobs is (assume zero for today's date) 
Definitions:
Monthly
Referring to something that occurs, is measured, or is paid every month.
Dollar Sales
Total revenue generated from the sale of goods or services, expressed in dollars.
Mixed Cost
A cost that contains both variable and fixed cost elements.
High-low Method
A technique in managerial accounting used to estimate the variable and fixed cost components of a cost formula, analyzing the highest and lowest levels of activity.
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