From the given table, age of children in group A = 7 yr, 7 yr, 9 yr, 8 yr, 10 yr, 10 yr
Age of children in group B = 7 yr, 9 yr, 11 yr, 12 yr, 12 yr, 12 yr
Mode in group A = 7 yr and 10 yr. [∴ 7 yr and 10 yr occurs most frequent, i.e. 2 times]
Range in group A = Maximum value - Minimum value = 10 - 7 = 3
Mode in group B = 12 yr [∵ 12 yr is the most frequent, i.e. 3]
Range in group B = Maximum value -Minimum value = 12 - 7 = 5