2TH §2.3 Freq.table, barchart, freq.polygon

• Wiskunde
• Middelbare school
• havo, vwo
• Leerjaar 2

Plan for today

• Entry ticket
• §2.3 Frequency table, Bar chart, frequency polygon
• Homework: Exercises 17, 18, 19 (page 57-58)

Learning goals

• you will learn what a frequency table is
• you will learn what a bar chart and a frequency polygon are

Entry ticket

In a survey, 90 students are asked to name their favourite fruit.

The results you can see in the table on the right.

a) Complete the table by calculating the angle       for each fruit.

b) Draw and label the pie chart.

Complete the table and draw the pie Chart

Entry ticket

In a survey, 90 students are asked to name their favourite fruit.

The results you can see in the table on the right.

a) Complete the table by calculating the angle       for each fruit.

b) Draw and label the pie chart.

 §2.3 Frequency table, bar chart and frequency polygon

Frequency

The frequency is the number of times a value appears.

Look at our previous pie chart. 90 students and their favourite fruit.

This is the frequency table that goes with the information given.

Bar chart

Another diagram you can make is a bar chart. Each value gets its own bar. The height or lenght of the bar indicates the corresponding frequency.

Frequency polygon

A frequency polygon is used to show how frequency changes over time. The horizontal axis shows the time, the vertical axis shows the frequency.

Together....

Homework 

• Do §2.3 Exercises 17, 18, 19 (page 57-58)

• Correct your answers with another colour pen.