Page 275 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Fig 2

3 Pie Chart (Fig 3)

Fig 3

A Pie Chart displays data in a ‘pie-slice’ format and illustrate proportion.Each pie slice represents the size of one
category relative to the size of other categories -- and in proportion to all the categories together (the whole pie).
Therefore, a Pie Chart illustrates part-whole relationships, and -- for every Pie Chart -- the whole pie should always
add up to 100%.
When you want to create and represent the composition of something When you want to show percentages or
proportional data
A Pie Chart works best for displaying data from four to seven categories.
Example: The pie chart below represents the proportion of types of transportation used by 1000 students to go
to their school.
4 Histogram
A Histogram shows continuous data in ordered rectangular columns.

Usually, there are no gaps between the columns in a Histogram.
A Histogram displays a frequency distribution (shape) of a data set. At first glance, histograms look like bar graphs.
However, there is a key difference between them. Bar Graphs represents categorical data and Histograms rep-
resent continuous data.(Fig 4)

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CITS : Engineering Drawing (Mechanical) - Exercise 11