The cumulative frequency graph shows the height of 150 Norway fir trees. 1504 125 Cumulative Frequency 100 Number of Trees Number of Trees 75 50 25 0.55 (a) Use the graph to estimate the median height and the interquartile range of the Norway firs. b) Which one of the following sketches of frequency diagrams shows the distribution of heights of the Norway firs? Height of Trees Diagram A 0.60 0.65 0.70 0.75 0.80 Height of Trees (m) Height of Trees Diagram C Number of Trees Number of Trees Height of Trees Diagram B F Height of Trees Diagram D

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