Age (in years) FrequencyWidth Length of the rectangle  1 - 25 1 15​×1=5  2 - 331  13​×1=33 - 5 62 26​×1=3 5 - 7 12 2 212​×1=6 7 - 10 9 3 39​×1=3 10 - 15 10 5 510​×1=2  15 - 174 2 24​×1=2 Width is not constant. So, we have to first calculate the length of rectangle to draw histogram according to the width as shown in the above figure.