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 25 12 15 35 14
(a) make a pareto chart for these data.
shannon, bann, erne, barrow, blackwater,

(b) make a circle graph for these data
shannon 34.7%
blkwtr 11.9%
barr 13.9%
erne 14.9%
bann 24.8%