# Find quartiles and interquartile range from CF diagram

In this lesson, we will calculate the median, upper and lower quartiles and the interquartile range from a cumulative frequency diagram

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the modal class?

1/3

Q2.What number should replace the star?

2/3

Q3.What are the coordinates of the last point on the cumulative frequency diagram?

3/3

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.What is the modal class?

1/3

Q2.What number should replace the star?

2/3

Q3.What are the coordinates of the last point on the cumulative frequency diagram?

3/3

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

Quiz:

# Find quartiles and interquartile range from a cumulative frequency diagram

Find the median, upper and lower quartiles and the interquartile range from a cumulative frequency diagram

Q1.What is the median?

1/3

Q2.What is the interquartile range?

2/3

Q3.How many people took longer than 4 minutes to solve the problem?

3/3

Quiz:

# Find quartiles and interquartile range from a cumulative frequency diagram

Find the median, upper and lower quartiles and the interquartile range from a cumulative frequency diagram

Q1.What is the median?

1/3

Q2.What is the interquartile range?

2/3

Q3.How many people took longer than 4 minutes to solve the problem?

3/3

# Lesson summary: Find quartiles and interquartile range from CF diagram

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Jog

On the spot:
Dance