Practice30Create account

A histogram has UNEQUAL class widths. To draw it correctly, the height of each bar must be the:

Class 9Bar Graphs and HistogramsStatistics and Probability
  • AFrequency density (frequency divided by class width)
  • BPlain frequency
  • CClass mark
  • DCumulative frequency

Step-by-Step Solution

With unequal widths, bar heights are adjusted to frequency density (frequency / width) so that area stays proportional to frequency.
Answer: A) Frequency density (frequency divided by class width)

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Bar Graphs and Histograms practice questions

More Class 9 Bar Graphs and Histograms practice

In a histogram with unequal widths, a class of width 20 has frequency 30, while all…A frequency polygon is drawn for classes 10-20, 20-30, 30-40 with frequencies 5, 9, 4.…Two sections A and B of Class 9 made frequency polygons of marks on the same axes. At…A continuous distribution has classes 0-10, 10-20, 20-30, 30-40 with frequencies 4, f,…A histogram of heights (cm) has classes of equal width 5: 150-155, 155-160, 160-165,…