中等math-u08-d02
In a histogram with unequal class widths, the frequency of a class is best represented by:
A. The area of each bar✓ 答案
B. The colour of each bar
C. The outline of each bar only
D. The midpoint label of each class
解說
Frequency equals area, so with unequal widths the bar height is the frequency density. Reading heights as frequencies would overstate the wider classes.