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Home >> Graphs >> Double Bar Graph >> Double Bar Graph
We hope that you are familiar with Bar Graph and if not, this topic is already here Bar Grap
A single or simple bar graph usually represents value to a single set of data. But when we need to represent and compare two sets of data, we need Double Bar Graphs.
Following example further illustrates Double Bar Graphs.
Example  Temperature of two cities X & Y for entire week is represented in the following tabular form.
Temperature  Mon  Tue  Wed  Thu  Fri  Sat  Sun  City X  27  28  30  31  29  31  27  City Y  30  29  30  29  28  32  28 
Draw a double bar graph and answer the following questions:<
1) On which day the temperature of both cities is same ?
2) On which day there is maximum difference in temperature of both cities ?
3) On which day there is least difference in temperature of both cities ?
4) Hottest and coldest days(s) for both cities ?
Answer  Below is the required Double Bar Graphs representing temperature of City X and City Y from Monday to Sunday:
Below are answers to questions:
Question 1  On which day the temperature of both cities is same ?
Answer  The temperature of city X and Y is same on Wednesday i.e 30 degrees
Question 2  On which day there is maximum difference in temperature of both cities ?
Answer  Maximum difference in temperature of both the cities is on Thursday i.e. 7 degrees difference
Question 3  On which day there is least difference in temperature of both cities ?
Answer  Least difference in temperature of both the cities is on Tuesday i.e. 1 degree difference only.
Question 4  Hottest and coldest days(s) for both cities ?
Answer 
Hottest Day for City X = Monday i.e. 35 Degrees
Hottest Day for City Y = Wednesday i.e. 30 Degrees
Coldest Day for City X = Sunday i.e. 25 Degrees
Coldest Days for City Y = Thursday & Friday Sunday i.e. 25 Degrees each.

