Using awk to calcluate average file size

Hi I want to use awk to find out:

a) The total number of files in a directory
b) The total filesize
c) The average filesize

I know I need to ls-l | awk ....something ....

but its the something Im stuck on!! Can anyone help?
Who is Participating?
ls -l | awk '$6{b+=$5;a+=1}END{print a,b,b/a}'
stummjAuthor Commented:
Thanks Ozo
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