1. first add two new columns to compute average adjusted gross income and average wages and salaries income per return (report/family), both in thousands, for each county (hint: average income would be total income divided by total number of tax returns). 2. create a frequency distribution, cumulative relative frequency distribution, and histogram for average adjusted gross income per return in u. s. counties. use bin sizes of 4. interpret the results. do any data points appear to be outliers in this distribution (hint: if you find any row with measurement errors, you should remove them and update the data set)?