A bar chart illustrates data through either horizontal or vertical bars, with the length of each bar directly proportional to the quantity it signifies.
There are 3 main types of bar charts:
Note: When constructing a bar chart it is important to choose a suitable scale to represent the frequency.
Example 1: The bar graph given below shows the sales of books (in thousand number) from six branches of George Orwell publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches – Z_{1}, Z_{2}, Z_{3}, Z_{4}, Z_{5} and Z_{6} of a publishing Company in 2000 and 2001.
Total sales of branch Z_{6} for both the years is what percent of the total sales of branches Z_{3} for both the years?
(a) 68.54%
(b) 71.11%
(c) 73.17%
(d) 75.55%
Ans: (c)
Example 2: The bar graph given below shows the sales of books (in thousand number) from six branches of George Orwell publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches – Z_{1}, Z_{2}, Z_{3}, Z_{4}, Z_{5} and Z_{6} of a publishing Company in 2000 and 2001.
What is the ratio of the total sales of branch Z_{2} for both years to the total sales of branch Z_{4} for both years?
(a) 2 : 3
(b) 3 : 5
(c) 4 : 5
(d) 7 : 9
Ans: (d)
Example 3: The bar graph given below shows the sales of books (in thousand number) from six branches of George Orwell publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches – Z_{1}, Z_{2}, Z_{3}, Z_{4}, Z_{5} and Z_{6} of a publishing Company in 2000 and 2001.
What is the average sales of all the branches (in thousand numbers) for the year 2000?
(a) 73
(b) 80
(c) 83
(d) 88
Ans: (b)
Average sales of all the six branches ( in thousand numbers) for the year 2000
= 80
Example 4: The bar graph given below shows the sales of books (in thousand number) from six branches of George Orwell publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches – Z_{1}, Z_{2}, Z_{3}, Z_{4}, Z_{5} and Z_{6} of a publishing Company in 2000 and 2001.
Total sales of branches Z_{1}, Z_{3 }and Z_{5} together for both the years (in thousand numbers) is?
(a) 250
(b) 310
(c) 435
(d) 560
Ans: (d)
Total sales of branches Z_{1}, Z_{3} and Z_{5} for both the years (in thousand numbers)
= (80 + 105) + (95 + 110) + (75 + 95)
= 560.
Example 5: The bar graph given below shows the sales of books (in thousand number) from six branches of George Orwell publishing company during two consecutive years 2000 and 2001.
Sales of Books (in thousand numbers) from Six Branches – Z_{1}, Z_{2}, Z_{3}, Z_{4}, Z_{5} and Z_{6} of a publishing Company in 2000 and 2001.
What percent of the average sales of branches Z_{1}, Z_{2} and Z_{3} in 2001 is the average sales of branches Z_{1}, Z_{3} and Z_{6} in 2000?
(a) 75%
(b) 77.5%
(c) 82.5%
(d) 87.5%
Ans: (d)
Average sales (in thousand number) of branches Z_{1}, Z_{2} and Z_{3} in 2001
Average sales (in thousand number) of branches Z_{1}, Z_{3} and Z_{6} in 2000
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