Archaeology: Ireland 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 19 8 15 33 14

(Based on information from Crossing the Rubicon, Bronze Age Studies 5, Lorraine Bourke, Department of Archaeology, National University of Ireland, Galway.)

(a) Make a Pareto chart for these data.

(b) Make a circle graph for these data.

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