College Math

College Math Study Guide

you get the complete pie. Hence, it is vital to understand that pie charts explain the size relationship between different parts of one whole thing. For instance, difference slices of a pie chart may represent the profits contributed by different branches of a company, where when we add all the pies, we get the sum total profits earned by the company. Let us now see how a pie chart looks and how can we read and interpret the meaning. The pie chart given below shows the survey results among 200 school students to learn the mode of transportation used by them to commute to school.

Mode of transportation used by 200 students

Bicycle 5%

Car 15%

Bus 44%

Walking 36%

There are two things which can be found in a pie chart that is percentages and area. It can be interpreted from the pie chart given above that the maximum proportion of student uses bus, followed by walking, car, and the least proportion make use of bicycles for commuting to school. Further, we can also find the number of students, since percentages are given to us. In this case, we know the sum total of the pie is 200. Thus, the number of students commute through bus is 44%, that is 44/100*200 = 88 out of 200 students make use bus. Similarly, we can find the other figures. It should be noted that the data represented by individual pie slices should be mutually exclusive and should not overlap each other. 5.6 Measures of Central Tendency and Measures of Dispersion Once the data is tabulated and graphed, the same can be summarized using measures of central tendency and measures of dispersion. The measures of central tendency are the measures of location within a distribution. Mean, median, mode, and range are considered the measures of central

©2018

Achieve

Page 90

of 120