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The abscissa of the point of intersection of the Less Than Type and of the More Than Type cumulative frequency curves of a grouped data gives its

The abscissa of the point of intersection of the ‘less than type’ and ‘more than type’ cumulative frequency curves of the grouped data gives its median as it gives accurate mid - point among all values.

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The median of a frequency distribution is found graphically with the help of

 6

The cumulative frequency table is useful in determining the

 8

If xi's are the midpoints of the class intervals of a grouped data, fi's are the corresponding frequencies and 7 is the mean then

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For finding the mean by using the formula, , we have ui = ?