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Mathematics 17 Online
OpenStudy (anonymous):

Each student in a class is in one of three tutorial sections: section1 (average =68, SD=8, number of student =25); section2 (average = 75, SD=8, number of student =20); section 3 (average =60, SD=8, number of student =32). Find the SD score of this class

OpenStudy (anonymous):

are there any options

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