Histograms for the county demographic data in Exercise 9c

The fields, in order, are:

[ POP_80], [ POP_90], [ POP_93], [ POP_98], [ POP_GROWTH], [ HH_80], [ HH_90], [ HH_93], 
[ HH_98], [ HH_GROWTH], [ RACE_BASE], [ PCT_WHITE], [ PCT_BLACK], [ PCT_ASIAN], [ PCT_OTHER], [ PCT_HISP], 
[ INC_BASE], [ INC_150KUP], [ INC100_150], [ INC_75_100], [ INC_50_75K], [ INC_35_50K], [ INC_25_35K], [ INC_15_25K], 
[ INC_5_15K], [ INC_0_5K], [ AVG_INC], [ MED_INC], [ PER_CAPINC], [ PCT_MALE], [ PCT_FEMALE], [ AGE_BASE], 
[ PCT_0_4YRS], [ PCT_5_9YRS], [ PCT10_14YR], [ PCT15_17YR], [ PCT18_20YR], [ PCT_21_YRS], [ PCT22_24YR], [ PCT25_29YR],
[ PCT30_34YR], [ PCT35_44YR], [ PCT45_54YR], [ PCT55_59YR], [ PCT60_64YR], [ PCT65_74YR], [ PCT75_84YR], [ PCT85YR_UP],
[ MED_AGE], [ AVG_AGE], [ PCT_55_], [ PCT_30_54], [PCT_0_29]