Line graph is used to represent change in data over a period of time. Value of data represented in a line graph changes continuously over a period of time. This is most commonly used for representing change in price of a commodity over the years, change in body temperature of a patient with time etc.
A line graph representing change in speed with time for a car is depicted below.
Parts of Line Graph-
A line graph consist of
(i) Vertical and Horizontal scales with label
(ii) Data Points corresponding to the different values.
(iii) Line joining the data points
Lets Work Out-
Example- The table shows the daily earning of a store for a Week.
(a) Construct a line graph for the given frequency table.
(b) On which day of the week were the earning maximum and minimum.
The line graph for the given frequency table is as below:
From the line graph it is clear that, Maximum earning was on Friday and the Minimum earning was on Wednesday
Bar graphs are most common kind of graphical representation, we observe in our day to day life. A bar graph consists of one or more horizontal/vertical bars which represent the numeric value of the commodity on the graphical scale. A bar graph comparing attendance in percentage with the number of students is depicted below.
Pie graph is used to compare various parts of a whole quantity. For example: if you want to compare interests of various people in a country, we can represent it with the help of pie graph. A pie graph comparing sales of various wood products is given below.
Histogram is similar to a bar graph. It represents the data in an interval. A histogram representing frequency of various plants in a height range is given below.
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