A pencil maker ships pencils in boxes of size 50, 100 and 200. Due to packaging issues, some pencils break. About the 20 boxes he has supplied to a shop, the following information is available: * Box no. 1 through 6 have 50 pencils, Box no. 7 through 16 have 100 pencils and Box no. 17 through 20 have 200 pencils. * No box has less than 5% or more than 20% broken pencils. Following is the frequency table of the number of broken pencils for the twenty boxes (No. of broken pencils: No. of boxes): 5: 1; 6: 2; 7: 4; 9: 3; 11: 1; 15: 2; 19: 1; 20: 3; 29: 1; 31: 1; 33: 1.