1 In a particular city there are 51 buildings of historical interest. The following table presents the ages of these buildings, given to the nearest 50 years. Age (years) No. buildings (f) 50-150 15 C 200-300 18 350-450 12 a Write down the lower and upper boundary values of the class containing the greatest number of buildings. b State the widths of the four class intervals. Illustrate the data in a histogram. d Estimate the number of buildings that are between 250 and 400 years old. ​