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Four sections of an introductory statistics course took the same 100-point exam.The means for the four sections and the number of students in each section

Four sections of an introductory statistics course took the same 100-point exam.The means for the four sections and the number of students in each section are as follows:Show your work.

SectionXN

0170.2215

0276.3825

0372.1517

0474.0612

The overall mean for the four sections =

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