remove some data rows

Author: FarrelAD

data/salary_data.csv

@@ -19,13 +19,3 @@ YearsExperience,Salary
 5.3,83088.00
 5.9,81363.00
 6.0,93940.00
-6.8,91738.00
-7.1,98273.00
-7.9,101302.00
-8.2,113812.00
-8.7,109431.00
-9.0,105582.00
-9.5,116969.00
-9.6,112635.00
-10.3,122391.00
-10.5,121872.00