Question

4. Cumulative Frequency Series :
Cumulative frequency range refers to a series in which the frequency of different classes is not separated by the category, but the frequencies are written in a cumulative form. In such a category, both the boundaries of each classes are not written. Only upper or lower limits are written. When writing a cumulative frequency based on the upper limit, the word ‘less than’ is written before the term value, and while writing a cumulative frequency based on the lower limit ‘more than’ is written after the term value. While solving question of the cumulative frequency series, it is first converted from cumulative to simple frequency.

Answer 1

Explanation:

A frequency-curve is a smooth curve for which the total area is taken to be unity. It is a limiting form of a histogram or frequency polygon. The frequency-curve for a distribution can be obtained by drawing a smooth and free hand curve through the mid-points of the upper sides of the rectangles forming the histogram.