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 18 12 15 32 14 (a) Make a Pareto chart for these data. 40 32 32 30 30 pearheads pearheads No. of Spearheads No. of Spearheads 20 1 20 15 NO. OF 12 NO. 10 10 O 0 Shannon Bann Eme Barrow Blackwater Blackwater Barrow Eme Bann Shannon 0 Barn Barrow Blackwater Erne Shannon Shannon Eme Blackwater Barrow Ban (b) Make a circle graph for these data. Shannon - 40.4% Shannon - 41.3% Shannon - 35.2% Bann - 19.8% Blackwater - 45% Bann - 22.5% Blackwater - 6.5% Bann - 20.7% Blackwater - 13.2% Barr - 15.7% Barr - 15.2% Erne - 16.5% O Erne - 16.9% Erne - 16.3% Barr - 15.4% Shannon - 31.5% Bann - 24.7% Blackwater - 11.2%% O Barr - 15.7% Erne - 16.9%