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                        In this case, the evolutionary algorithm built into Solver uses a combination of random search and good solution "breeding" to find good solutions similarly to how evolution works in biological contexts.
Press Solve and watch Excel do its thing until the evolutionary algorithm converges.
Note that your cluster centers may look different from the spreadsheet provided with the book, because the evolutionary algorithm employs random numbers and does not give the same answer each time.
Now, your clusters may be slightly different than mine in both order and composition due to the evolutionary algorithm, but hopefully not substantively so.
The  way an evolutionary algorithm works  is  loosely modeled  on the  way
 
                        
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