The following histograms represent the estimates of the lifespan of an elephant (in years) given by 11 male and 8 female eleven-year olds. Two graphs, one above the other, each consisting of a horizontal axis labelled 'Estimated life span in years' with a scale from zero to 100 marked at intervals of 20 and a vertical axis labelled 'frequency' with a scale from zero to 3 marked at intervals of 1. The upper histogram is labelled 'Male estimates of elephant life span' and has six vertical bars, each of width 10, with the first starting at 0. From left to right the heights of the bars are 2, 2, 1, 3, 1, 2 respectively. The lower histogram is labelled 'Female estimates of elephant life span' and has five vertical bars, each of width 10, with the first starting at 30. The height of the first two bars are 3, 2 respectively. There is then a gap, and the third bar starts at 70 and has height 1. There is then a gap, and the fourth bar starts at 90. From left to right the heights of the last two bars are 1, 1 respectively. The description for this figure is