Calculate the missing information below. Starter Calculate the missing information below. __ cm __ cm 4.2 cm Area = 15 cm² 9 cm 6 cm Area = 21 cm² Area = __ cm² Area = 24 cm² __ cm 8 cm 1 cm Area = 10 cm² 4 cm 3 cm __ cm __ cm Area = 36 cm²

Calculate the missing information below. Starter Calculate the missing information below. 5 cm 4 cm 4.2 cm Area = 15 cm² 9 cm 6 cm Area = 21 cm² Area = 9 cm² Area = 24 cm² 5 cm 8 cm 1 cm Area = 10 cm² 4 cm 4.5 cm 3 cm 2.5 cm Area = 36 cm²

What is wrong with this bar chart? Frequency Time t 5 10 15 20 25 30 What is wrong with this bar chart? 10 < t ≤ 30 30 < t ≤ 35 35 < t ≤ 40 40 < t ≤ 50 50 < t ≤ 70

Frequency Frequency density = Class width Time taken (t seconds) 5 30 < t ≤ 35 4 35 < t ≤ 40 8 40 < t ≤ 50 27 50 < t ≤ 70 24 5 ÷ 20 = 0.25 4 ÷ 5 = 0.8 8 ÷ 5 = 1.6 27 ÷ 10 = 2.7 24 ÷ 20 = 1.2

10 20 Frequency density Time t 0.5 1 1.5 2 2.5 3 30 40 50 60 70

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10 20 Frequency density Time t 0.5 1 1.5 2 2.5 3 10 x 2.7 = 27 When interpreting histograms, all you need to do is remember that the frequency is given by the AREA of each bar. 5 x 1.6 = 8 20 x 1.2 = 24 5 x 0.8 = 4 20 x 0.25 = 5 30 40 50 60 70

Answers Distance (d metres) Class width Frequency density Frequency 10 1 10 < d ≤ 20 100 20 < d ≤ 30 7 70 30 < d ≤ 45 15  2 30 45 < d ≤ 70 25  1 Time (t hours) Class width Frequency density Frequency 0 < t ≤ 1 1 6 1 < t ≤ 2  30 30 ½  60 1 ½  24 36 4 < t ≤ 7  3  6 18

What are the differences between bar chart and histograms? Plenary   What are the differences between bar chart and histograms?