The table on the next page shows the distribution of adults by the last digit of their age, as reported in the Census of 1880 and the Census of 1970.12 You might expect each of the ten possible digits to turn up for 10% of the people, but this is not the case. For example, in 1880, 16.8% of all persons reported an age ending in 0-like 30 or 40 or 50. In 1970, this percentage was only 10.6%.

(a) Draw histograms for these two distributions. P-968