Mathematics
In a histogram, the area of each rectangle is proportional to :
the class-mark of the corresponding class-interval
the class-size of the corresponding class-interval
frequency of the corresponding class-interval
cumulative frequency of the corresponding class interval
Answer
In a histogram, the bases represent the class intervals on the horizontal axis whereas the area represents the frequency.
If class sizes are equal, the height is proportional to the frequency. If they are unequal, heights are adjusted so the area remains proportional to the frequency.
Hence option 3 is the correct option.
Related Questions
A frequency polygon is constructed by plotting frequency of the class interval and the :
upper limit of the class
lower limit of the class
either (a) or (b)
mid-value of the class
In the 'less than' type of ogive, the cumulative frequency is plotted against :
the lower limit of the concerned class interval
the upper limit of the concerned class interval
the mid-value of the concerned class interval
any value of the concerned class interval
If the class intervals 40 - 44, 45 - 49, 50 - 54 etc. in a frequency table are converted into continuous form, they become
40 - 45, 45 - 50, 50 - 55, etc
39 - 44, 44 - 49, 49 - 54, etc
39.5 - 44.5, 44.5 - 49.5, 49.5 - 54.5, etc
any of the above