T-SQL (SS2K8) :: Finding 5 Most Recent Records For Each Customer With Abnormal Order Amounts

The database consists of the following tables:

create table dbo.customer (
customer_id int identity primary key clustered,
customer_name nvarchar(256) not null
)
create table dbo.purchase_order (
purchase_order_id int identity primary key clustered
customer_id int not null,
amount money not null,
order_date date not null
)

Implement a query for the report that will provide the following information: for each customer output at most 5 different dates which contain abnormally high or low amounts (bigger or less than 3 times SDTDEV from AVG), for each of these dates output minimum and maximum amounts as well.

Possible result: [URL] ......