If the following jobs are sequenced according to the SPT rule, then the mean completion time (in days) for all the jobs is (assume zero for today's date) 
Definitions:
Dominant Firm Model
A market structure where one large firm controls the majority of the market share, influencing prices and output levels while smaller firms act as price takers.
Market Structure
Refers to the organization and characteristics of a market, including the degree of competition, number of firms, and the distribution of market shares.
Large Firm
A business entity characterized by a large scale of operations, potentially including extensive product lines, significant market share, or substantial workforce.
Profit Maximizing Price
The price at which a firm can generate the highest possible profit, determined by the intersection of the firm's supply curve and the market demand curve.
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