Using a histogram to estimate the median Histograms Using a histogram to estimate the median

Draw a histogram to represent the data Example The distribution below represents the examination marks of 120 students. Mark 0 –20 20 –30 30 –35 35 –45 45 –55 55 –70 Frequency 9 12 20 29 27 23 Draw a histogram to represent the data Use the histogram to estimate the median.

Example The following table gives the heights of 80 children. Draw a histogram to represent this information. Using the histogram estimate the height by which 20% of the children exceed. Height (cm) Frequency 130 – 135 5 135 – 140 7 140 – 150 15 150 – 160 29 160 – 165 13 165 – 170 10 170 – 175 1