Mathematics Grade 8: Data Presentation

8 Questions

What is the objective of the worksheet on data presentation?

To solve problems involving frequency tables, bar charts, and pie charts.

In the manager's survey, what is the least popular method of transport?

Answer depends on the data provided in the survey.

How do you calculate the total number of employees in the manager's survey?

Add up the frequencies of all modes of transport.

What is the purpose of a frequency table?

To organize and display data in a concise and meaningful way.

How do you construct a bar chart?

Plot the categories on the x-axis and the frequencies on the y-axis.

What is the difference between a bar chart and a pie chart?

A bar chart compares categorical data, while a pie chart shows proportions of a whole.

What fraction of the counters in the bag are white?

Fraction depends on the data provided in the pie chart.

How do you find the distance between Hasan and Mohammed?

Use the Pythagorean theorem: distance = √(10² + 8²).

Study Notes

Data Presentation and Analysis

The theme is data presentation, and the code is M-G8-WS3.1.
The subject is mathematics, and the teacher is Ms. Nebras/Mr. Emmanuel.

Frequency Tables and Charts

A frequency table is a table that shows the frequency of each value in a dataset.
A bar chart is a graphical representation of a frequency table.
A pie chart is a circular chart divided into sectors to show the proportion of each category.

Problem-Solving

To find the least popular method of transport, identify the method with the lowest frequency.
To find the most popular method of transport, identify the method with the highest frequency.
To calculate the total number of employees, add up the frequencies of all methods of transport.

Frequency Table and Charts Examples

Complete a frequency table by counting the number of times each value appears in the dataset.
Draw a bar chart to show the frequency of each value in the dataset.
Draw a pie chart to show the proportion of each value in the dataset.

Fractions and Pie Charts

To find the fraction of counters that are white, divide the number of white counters by the total number of counters.
To find the fraction of counters that are red, divide the number of red counters by the total number of counters.
To find the number of black counters, subtract the number of red and white counters from the total number of counters.

Right-Angle Triangles

To find the missing sides in a right-angle triangle, use the Pythagorean theorem or other trigonometric methods.

Distance and Direction

To find the distance between two people, use the Pythagorean theorem or other methods to calculate the distance between their positions.