Histograms Example The table shows the weights of employees in a factory. Draw a histogram to represent these results. Weight (kg) Frequency 40 – 70 3 70 – 75 8 75 – 80 17 80 – 90 32 90 – 100 25 100 – 120 9

1 2 3 4 5 20 40 60 80 100 120 Weight

a) Copy the table. Complete the frequency densities. Example The students from San Dimas High School took part in a “fun-run” for charity. The table shows the time the students took. Time (mins) 40≤ t<60 60 ≤ t<70 70 ≤ t<80 80 ≤ t<90 90 ≤ t<100 100≤t<120 No of students 28 43 58 40 34 18 Frequency density 1.4 a) Copy the table. Complete the frequency densities. b) Draw a histogram to illustrate this data

1 2 3 4 5 6 20 40 60 80 100 120 Time

Example The following table gives the heights of 80 children. Draw a histogram to represent this information. Height (cm) Frequency 130 – 135 5 135 – 140 7 140 – 150 15 150 – 160 29 160 – 165 13 165 – 170 10 170 – 175 1

1 2 3 120 140 160 180 Height freq. Density