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In calculating the mean of grouped data, grouped in classes of equal width, we may use the formula
\(\overline X = a+\frac{\sum f_id_i}{\sum f_i}\)
where a is the assumed mean. a must be one of the mid-point of the classes. Is the last statement correct? Justify your answer.
Important!
This is a self assessment task. Solve this question and assess the solution steps after the completion of test on your own.
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