Processing and Representing Data Drawing and interpreting frequency

Processing and Representing Data Drawing and interpreting frequency diagrams and histograms

Learning Objectives • Draw a frequency diagram for grouped discrete data • Draw a histogram for continuous data Grade D Textbook Reference • Section 3. 5 page 68 Further Practise • MEP • 10 Ticks

A frequency diagram can be drawn from grouped discrete data. You have been doing this since Primary school – only the words have changed 15 14 There is a gap between the bars because there is no whole number between 5 and 6 or 11 and 12. . Frequency 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -5 6 -11 12 - 17 Number of games 18 - 23 24 - 29

A histogram can be drawn from grouped continuous data

Drawing a Histogram from raw data. The following data shows the height (as measured to the nearest cm) of a random selection of cut flowers from Becky’s Flower Shop. 42 34 39 49 62 69 28 24 37 38 10 33 42 61 31 30 21 27 56 50 15 35 54 33 45 33 20 44 33 31 59 55 47 15 42 68 53 30 45 29 Height (h) in cm Choose a suitable class intervals and display in a frequency table. Tally Frequency 10 h < 20 3 20 h < 30 6 30 h < 40 13 40 h < 50 8 50 h < 60 6 60 h < 70 4

Drawing a Histogram from raw data. Height (h) in cm Tally Complete the frequency table then draw the histogram. Frequency 10 h < 20 3 20 h < 30 6 30 h < 40 13 40 h < 50 8 50 h < 60 6 60 h < 70 4 15 Heights of Flowers 10 f 5 0 10 20 40 30 50 Height (cm) 60 70

Your Turn Exercise 3 F page 70

GCSE Statistics Extension 3. 5 The shape of a distribution Exercise 3 D page 92