2019 · Q70
The following pairs relate to frequency distribution of a discrete variable and its frequency polygon. Which one of the following pairs is not correctly matched?
Elementary MathematicsStatistics
- ABase line of the polygon – X-axis
- BOrdinates of the vertices of the polygon – Class frequencies
- CAbscissa of the vertices of the polygon – Class marks of the frequency distribution
- DArea of the polygon – Total frequency of the distribution
Explanation
Base line = X-axis, ordinates = class frequencies and abscissae = class marks are all standard. But the area of a frequency polygon only approximates (total frequency)×(class width) and depends on how the polygon is closed on the X-axis — it is not a generally correct match, so pair D is the odd one out.