Answer :

Given: number of classes = 12,

Class width = 2.5, and


Lowest class boundary = 8.1


Upper class is given by,


Upper class boundary = Lower class boundary + (width × number of classes)


Substituting values,


Upper class boundary = 8.1 + (2.5 × 12)


Upper class boundary = 8.1 + 30 = 38.1


Hence, upper class boundary is 38.1


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