The percent error for the manager's estimate is 66.7%
Percent error
Using this formula
Percent error=First day number of customers-Expected customers/Expected customers×100
Let plug in the formula
Percent error=75 customers-45 customers/45 customers×100
Percent error=30 customers/45 customers×100
Percent error=66.66%
Percent error=66.7(Approximately)
Inconclusion the percent error for the manager's estimate is 66.7%.
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