For finding the mean by using the formula, , we have u i = ? A mathematical formula for calculating the mean (x-bar) using the step-deviation method: x-bar equals A plus h multiplied by the ratio of the sum of f_i u_i to the sum of f_i.

Q9 of 145 Page 410

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

Since, d_i = x_i – A,

where d_i = deviation and A = Assumed mean

And u_i = d_i/h = (x_i – A)/h,

where h = class width

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

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

In the formula, for finding the mean of the grouped data, the d_i's are the deviations from A of

While computing the mean of the grouped data, we Assume that the frequencies are

Questions · 145

9. Mean, Median, Mode of Grouped Data, Cumulative Frequency Graph and

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