Answer :

lower class boundary = lower limit - 0.5

Upper class boundary = upper limit + 0.5


class - size = upper class boundary – lower class boundary


Mid value of class


Frequency density


The class limit is of inclusive type


From the given data, we can see that number of students in the range 1 - 10 marks are 6. Similarly for other ranges Table is formulated below, Using the above formulas.



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