Frequency Polygons and Cumulative Frequency

The video tutorial explains how to draw frequency polygons from group frequency tables, focusing on plotting midpoints and avoiding common mistakes. It highlights the relevance for Edexcel exams and provides mnemonic aids for remembering the process. The tutorial includes examples and critiques of frequency polygons, emphasizing the importance of correct plotting and scale interpretation.

Which exam boards do not assess frequency polygons?

• All exam boards assess it

• OCR and Edexcel

• Edexcel and AQA

• AQA and OCR

Where should you plot the points for a frequency polygon?

• At the start of each interval

• Randomly on the axis

• At the midpoints of each interval

• At the end of each interval

What is the midpoint for the interval 20 to 40?

• 30

• 25

• 40

• 20

What is a common mistake when drawing frequency polygons?

• Using different colors

• Plotting at the endpoints

• Using curved lines

• Connecting the first and last points

What does 'Poly the Shark' help you remember?

• The axis labels

• The frequency values

• The midpoint plotting method

• The shape of the polygon

How does a cumulative frequency diagram differ from a frequency polygon?

• It uses bars

• It always increases

• It looks like a shark fin

• It uses midpoints

In the second example, what is the frequency for the midpoint 15?

• 40

• 38

• 22

• 70

What is one mistake in the pre-drawn frequency polygon?

• Correct frequency values

• Properly connected lines

• Graph joined to the axis

• Points plotted at midpoints