how to draw average rainfall of last five year of a state in a pie chart???
Answers
Step-by-step explanation:
If you look around you, you will notice many visual interpretations of data around. Be it graphs, tables, charts, lines etc. They communicate the information clearly and at one glance. Here we will be learning about two such widely used visual representations, namely Histograms and Pie Charts.
A histogram is what we call an area diagram. It indicates the frequency of a class interval. The class interval or the range of values is known as bins or classes with reference to histograms. A bar indicates the number of data points within a specific class. That means the higher the frequency of a particular class, higher the bar.
Let us see an example of a Histogram. From the below-given table of the various heights of trees in a region, we will draw a histogram to illustrate how it is done. Let us look at the frequency table now.
Height of Trees (ft) No. of trees
60-65 3
65-70 3
70-75 8
75-80 10
80-85 5
85-90 2
Now here the heights of the tree are continuous data. These class intervals are the bins. And the number of trees are obviously the frequency. And now let us draw a histogram (given below) that represents the above data.
Histograms and Pie Charts
Histograms vs Bar Charts
In bar graphs, each bar represents one value or category. On the other hand in a histogram, each bar will represent a continuous data
In a bar graph, the x-axis need not always be a numerical value. It can also be a category. However, in a histogram, the X-axis is always quantitative data and it is continuous data.
Due to the above factor, a histogram can be observed for its skewness i.e. a pattern or tendency of data to fall in more on the low end or high end etc. Same cannot be done for a bar chart
Pie Charts
A pie chart or a pie graph is a circular representation of data. A pie chart not only represents frequency but also numerical proportion. Each section of a pie chart is the proportionate quantity of the whole data. And the total value of a pie chart is always 100 (just as a percentage)
How to draw a Pie Chart
Let us now take a step-by-step look at how to represent data via pie charts
Data: Gather your values and arrange them in a descending order.
Find denominator: Add all the values to arrive at a whole value or number. This will be your denominator
Percentage: Now we calculate the percentage of each value in relation to the total values. We simply divide each value with the denominator we got from step 2. Also, it will be easier to leave the value in decimal form
Calculate the angles: So we multiply each percentage (in decimal form) by 360 (degrees in a circle)
Circle: And now we draw a circle to begin drawing a pie chart
Draw individual sections: Now with the help of a protractor we draw each section of the pie chart. We use the angles we obtained from step 4
Colour: Each section must be a different colour so it can be easily identified.
Answer:
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