Try following XPath and let me know if problem still persist:
//div[@id="avg_score_chart"]//*[name()="svg"]
For <g> elements:
//div[@id="avg_score_chart"]//*[name()="svg"]/*[name()="g"]
Update
Finally, this should be nearly the best option:
//div[@class="portlet light boxshadow"][contains(.,"Store Wise Performance")]/div//div[@class="amcharts-chart-div"]/*[name()="svg"]//*[name()="g"]/*[name()="path" and @fill="rgb(242,244,28)"]