how do we find mean using step deviation method if the classes are unequal?

should we make the classes equal in such a case?

If the class sizes are unequal, we can still use step deviation method by taking h to be a divisor of all di's. The example of this case is given in NCERT textbook on page 269.

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classses should first be made equal. Then Mean =Assume mean+sum of fiui/sum of fi * height of the class interval.


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