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How to generate moving Average of Last two days

Hi friend,  

These days I become little bit Lazy. The reason was my long leave from work. I visited my Hometown in Durga Puja. It was really very cheerful moment for me to meeting with parents and cousins. Please  don’t ask about my last 7 Days I was suffered with Eye-Flue. It isolated me becouse I was not  unable to use TV/Computer/Phone/Book, social media and SQL. After 6 days  now i become OK. Session of Diwali festival also comes up. So I should wake up and write some Diwali special Query. 

I started my SQL Server, opened SSMS and New Query Editor new problem …..

How to generate Running Average of Last two days?

Date Day Cost
08-Oct Wed  [10]
09-Oct Thurs [15]
10-Oct Fri [20]
13-Oct Mon [30]
14-Oct Tue [40]


create table #costCenter
dat  date,
days varchar(20),
cost  int

insert into #costCenter(dat,days,cost)

select '10/08/2014','Wed',10 union
select '10/09/2014','Thurs',15 union
select '10/10/2014','Friday',20 union
select '10/13/2014','Mon',30  union
select '10/14/2014','Tues',40 

select * from #costCenter


SELECT     dat,days,cost ,avg(cost) OVER (
FROM   #costCenter

Result :


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