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in Statistics by (47.3k points)
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In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula

where is the assumed mean. must be one of the mid-points of the classes. Is the last statement correct? Justify your answer.

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No, the statement is not correct. It is not necessary that assumed mean should be the mid – point of the class interval. a can be considered as any value which is easy to simplify it.

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