newjam

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Optional;
import lombok.extern.slf4j.Slf4j;
import org.skife.jdbi.v2.ResultSetMapperFactory;
import org.skife.jdbi.v2.StatementContext;
import org.skife.jdbi.v2.tweak.ResultSetMapper;

newjam

import           Data.Ratio
import qualified Data.Set   as S

data Op  = Add | Sub | Mul | Div
  deriving Eq
data Exp a = Bin Op (Exp a) (Exp a)
           | Num a
  deriving Eq

instance Show Op where

newjam

{-
Income quintiles in 2011. This represents the poorest fifth to the richest fifth
of income earners in america in 2001.
-}

income2011 = [15282.0, 37556.0,  61032.0, 93232.0, 197932.0]

{-
Find the average income of americans, by averaging the quintiles.