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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