What is the average endowment amount?
select avg(amount) from endowment
What is the minimum endowment amount?
select min(amount) from endowment
How many endowments are there that have an amount smaller than or equal to 10?
select count(*) from endowment where amount <= 10
List all the names of schools with this kind of endowment.
select t2.school_name from endowment as t1 join school as t2 on t1.school_id = t2.school_id group by t1.school_id having sum(t1.amount) <= 10