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Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. To understand how to approach.

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Presentation on theme: "Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. To understand how to approach."— Presentation transcript:

1 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. To understand how to approach a question about frequency polygons. Objectives

2 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. 50 people grew sunflowers for a competition. The heights of the sunflowers (in cm) are given in the following table: Draw a frequency polygon to represent this data. Height ( x cm) Frequency 2 5 10 20 8 5

3 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. Height ( x cm) Frequency 2 5 10 20 8 5 405060708090100 0 4 8 12 16 20 Frequency Height (cm) The midpoint of 40 and 50 is 45....

4 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. 405060708090100 0 4 8 12 16 20 Frequency Height (cm)....so plot frequency is 2 at height 45. x Height ( x cm) Frequency 2 5 10 20 8 5

5 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. 405060708090100 0 4 8 12 16 20 Frequency Height (cm) The midpoint of 50 and 60 is 55...plot 5 there. x x Height ( x cm) Frequency 2 5 10 20 8 5

6 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. 405060708090100 0 4 8 12 16 20 Frequency Height (cm) And so on..... x x x x x x Height ( x cm) Frequency 2 5 10 20 8 5

7 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. 405060708090100 0 4 8 12 16 20 Frequency Height (cm) Now join them up. x x x x x x Height ( x cm) Frequency 2 5 10 20 8 5

8 Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. Remember to draw a properly continuous scale on the horizontal axes. Summary Make sure that you label axes properly. Plot frequencies at the midpoints of each class. Join the points with straight lines.

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