Commercial dredging operations in ancient rivers occasionally uncover archaeological artifacts of great importance. One such artifact is Bronze Age spearheads recovered from ancient rivers in Ireland. A recent study gave the following information regarding discoveries of ancient bronze spearheads in Irish rivers. River Bann Blackwater Erne Shannon Barrow No. of spearheads 20 8 15 38 14 (a) Make a Pareto chart for these data. 40 40 40 38 38 38 30 30 30 No. of Spearheads No. of Spearheads 20 20 No. of Spearheads in 20 20 20 20 15 15 10 10 10 0 OBlackwater Barrow Erne Bann Shannon O Shannon Eme Blackwater Barrow Bann Bann Barrow Blackwater Erne Shannon 40 38 30 No. of Spearheads in 20 20 10 O 0 Shannon Bann Erne Barrow Blackwater