- Plot the points (130, 15), (140, 54), (150, 82), (160, 93), and (170, 100) on the graph. Connect them with straight lines to form the cumulative frequency graph.
- To estimate the number of people at least 145 cm tall, find the cumulative frequency at 145 cm on the graph (approximately 68). Subtract this from the total (100): 100 - 68 = 32.
- To estimate the median height, find the height corresponding to half the total frequency (50) on the graph. This is approximately 142 cm.
- To estimate the interquartile range, find the heights corresponding to the first quartile (25) and third quartile (75) on the graph. These are approximately 137 cm and 152 cm, respectively. The interquartile range is 152 - 137 = 15 cm.
Parent Tip: Review the logic above to help your child master the concept of frequency graph worksheet.
