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:
Latent Function
Unintended and unrecognized consequences of an institution or social phenomenon.
Education
The process of receiving or giving systematic instruction, particularly at a school or university, fostering knowledge and skill development.
Standardized Testing
A form of testing that requires all test takers to answer the same questions, or a selection of questions from a common bank of questions, in the same way, to enable a consistent measurement of their abilities or performance.
Cognitive Ability
The capacity to perform mental processes related to learning, thinking, reasoning, problem-solving, and memory.
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