Need to do chi square analysis on occurrences of a rare

Need to do chi square analysis on occurrences of a rare disease in an rural area of 1000 people vs. national averages for this rare disease. Data is based on different age groups:  National Avg.  Age Ranges % with disease 0 <age </= 20 2% 20<age</=40 5% 40<age60 20% Rural Age Ranges % with disease 0<age</=20 30 20< age </= 40 200 40<age60  185 Looking at national data, what is expected value of rural with disease? Is disease incidence significantly different than national?  What are standardized residuals? Interpret results.