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Question

# By connecting the center of top edge of bars of which type of plot, a line graph is obtained?

A
Bar graph
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B
Histogram
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Solution

## The correct option is B HistogramConsider the following histogram of the number of flights arrival per minute at different hours of the day in an airport: When the center of top edges of each bar of a histogram is connected, a line graph is obtained as follows: Here, the black line connected by orange dots is the line graph. Histogram is generated form a grouped frequency table, which is continous. Time (hours) Arrivals per minute 0600−0700 4 0700−0800 2 0800−0900 4 0900−1000 3 1000−1100 5 1100−1200 1 Hence, the obtained line graph is continuous. But, in a bar graph, data points are at discrete data points. ∴ Connecting the top edges of bars of a bar graph will not result in a proper line graph. However, we can generate a histogram from a bar graph and finally plot a line graph.

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