Concept:The mode of grouped data is determined graphically using a histogram.
Explanation:Grouped data is presented in class intervals, so the exact mode is not directly visible.
A histogram is drawn with bars whose heights represent the frequencies of the class intervals.
The tallest bar in the histogram indicates the modal class.
To find the exact mode, lines are drawn from the top corners of the tallest bar to the top corners of the adjacent bars.
The point where these two lines intersect gives the modal value on the horizontal axis.
Thus, the histogram is the correct graph for estimating the mode of grouped data.
A bar chart is used for ungrouped discrete data, not for grouped continuous data.
A frequency polygon only shows the trend of frequencies and does not locate the mode directly.
An ogive is used to determine the median and quartiles, not the mode.
Answer:D. Histogram