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In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula where a is the assumed mean. a must be one of the mid-points of the classes. Is the last statement correct? Justify your answer.

Vinay

No, the assertion isn’t right. It isn’t required that expected mean ought to be the mid – mark of the class span. a can be considered as any worth which is not difficult to work on it.