SELECT born_state, AVG(age) FROM head GROUP BY born_state
Show the average age of heads of departments born in each state with a bar chart.
CREATE TABLE management (
    department_ID int,
    head_ID int,
    temporary_acting text
)

CREATE TABLE department (
    Department_ID int,
    Name text,
    Creation text,
    Ranking int,
    Budget_in_Billions real,
    Num_Employees real
)

CREATE TABLE head (
    head_ID int,
    name text,
    born_state text,
    age real
)