Slide showing a line chart demonstrating 'Frequency-polygons of the Binomial (0.9 + 0.1)n for Various Values of n.' Slide shows a line chart demonstrating 'Frequency-polygons of the Binomial (0.9 + 0.1)n for Various Values of n.' The Y axis is labelled 'Frequency (as fraction of total frequency), and ranges from 0 to 0.4, whilst the X axis is labelled 'Number of successes' and ranges from 0 to 20. At varying points on the lines, n=10, n=50 and n=100. The title of the chart reads: 'Fig. 10.1.- Frequency-polygons of the Binomial (0.9 + 0.1)n for Various Values of n'. Late 19th to early 20th century