Question

how is class height taken?! h = 30?

Answer 1

class height = upper limit - lower limit. HERE , upper limit =60 and lower limit = 30. SO , 60-30=30 is the class height.

Answer 2

Class height can be taken by subtracting upper limit from lower limit i.e. class height = upper limit -lower limit
Here, the class height =60-30=30

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