1 st February 2013 Objective: To be able to create Frequency Polygons (grade C/D) Skills: Noticing, Making Links and Absorption By the end of the lesson: All: can identify the midpoint of grouped data Most: Plot a frequency polygon Some: Identify the modal class

Starter What is the midpoint between the following numbers? Green 1)0 – 10 2)40 – 50 3)30 – 40 4)0 – 100 5)0 – 50 Red 1)54 – 56 2) 5 – 9 3) 8 – 14 4) 38 – 52 5) 0 – 5

What is the midpoint between the following numbers? Green 1)5 2)45 3)35 4)50 5)25 Red 1)55 2) 7 3)11 4)45 5)2.5 Answers

Grouped Data Which day does your birthday fall in DayFrequency 1 st – 10 th 11 th – 20 th 21 st – 31 st

Greater than, Less than symbols In maths, we represent a numerical group using specific symbols x < 4 means x > 10 means

Using symbols to represent a group How much money do you spend a month on your phone? a) Up to £5 b) £5 or more and less than £10 c) £10 or more and less than £15 d) £15 or more and less than £20 We can use maths symbols to represent this !!! 0 M < 5 5 M < M < M < 20

Finding the Midpoint

Task 1 Paste the follow handout into your books. Then write next to each row the midpoint of the data as demonstrated previously. Extension available when finished

Solutions

Frequency Polygon In your GCSE these questions are worth 2 or 3 marks.

Finding the Midpoint

GCSE Question

Modal Class

The Steps What are the 3 steps to creating a frequency polygon?

Your Turn Complete the frequency polygon on the worksheet. When you are finished, there is an extension worksheet available.