LEARN MATH STEP BY STEP THROUGH VERY EASY PROCESS

BAR GRAPH INTERPRETATION

__BAR GRAPH INTERPRETATION -__

**Example.1) Observe this bar graph which is showing the sale of shirts
in a ready-made shop from
Monday to Saturday.**

**Q.1) What information does the above bar
graph give?**

**Ans.) The bar graph tells us the number of shirts sold on each day from Monday to Saturday.**

**Q.2) What is the scale
chosen on the horizontal line representing number of shirts?
**

**Ans.) The scale chosen
on the horizontal line, that is, x axis
is 1 unit length = 5 shirts.**

**Q.3) On which day
were the maximum number of shirts sold? How many shirts were sold on that
day?**

**Ans.) Since Saturday has the longest
bar, maximum number of shirts was sold on Saturday. The number of shirts
were sold were 60 X 5 = 300 shirts.**

**Q.4) On which day were the minimum
number of shirts sold?**

**Ans.) Minimum number of shirts was sold
on Tuesday. The number of shirts sold were 10 X 5 = 50 shirts.**

**Q.5) How many shirts were sold on Thursday?**

**Ans.) Thursday is represented by a bar of
35 units. Hence the numbers of shirts
sold on this day were 35 X 5 = 175 shirts.**

**The following
points should be noted while
making a bar graph:-**

**· The bars should be rectangular and
of equal width.
The spacing between the bars should be the same.**

**· The bar graph
should have a title.**

**· The x and y axes should be labelled showing what they represent.**

**· An appropriate scale
should be chosen, and the
scale should be mentioned.**

Example.2) Following table shows the number of bicycles manufactured in a factory during the years 1998 to 2002. Illustrate this data using a bar graph. Choose a scale of your choice.

**Q.1) In which year were the maximum
number of bicycles
manufactured?**

**Ans.) The year 2002 is the year represented by bar with maximum height. Hence maximum number
of cycles were sold in 2002, that is, 1200.**

**Q.2) In which year were the
minimum number of bicycles manufactured?**

**Ans.) The year 1999 is the year
represented by bar with minimum height. Hence minimum number of cycles
were sold in 1999, that is, 600.**

**Example.3) A survey on 150 people was done to know 'What is their favourite ice cream?'**

**
Ice-creams Vanilla Strawberry Chocolate Butterscotch
**

** Flavour 40 20 60 30
**

**The representation of the provided data will be as follows:**

**Since
the data represented here is along the y-axis of the graph and the height of the bars gives
the values, the above representation is the vertical bar graph.**

**The same simple
bar graph can be represented in the horizontal axis as
follows.**

**The
data represented here is along the x-axis of the graph, and the length of the bars gives the values.**

**Also,
it is clear from the above bar graphs that bars are of equal width and the
spacing between the bars should be the same.**

**The
title of the above bar graph is 'Favourite icecream'.**

**The x-axis and y-axis of the vertical
bar graph are named as 'Flavours of
icecream' and 'Number of people'. Similar way, the x-axis and y-axis of the
horizontal bar graph are named as 'Number
of people' and 'Flavors of
icecream'.**

**For
the vertical bar graph, the number of people considered from 0 to 70 with 10 points increments in each step along the y-axis. For the horizontal bar graph, the number of people considered from 0 to 70 with 10 points
increments in each step along the x-axis.**