What is the maximum savings balance?
select max(balance)from savings
What is the average?
select avg(balance) from savings
Who are names of the people that are above this average?
select t1.name from accounts as t1 join savings as t2 on t1.custid = t2.custid where t2.balance > (select avg(balance) from savings)
How many of them are there?
select count(*) from savings where balance > (select avg(balance) from savings)