Tacit function composition in Haskell

Say I have a `mean` function defined like so: ``` mean xs = sum xs / (fromIntegral $ length xs) ``` but I want it in some tacit form, like this: ``` mean = sum / (fromIntegral . length) ``` Is there a built-in Haskell way to do something along these lines without having to build up my own `tacit` function (something like this): ``` tacit :: (a -> b -> c) -> (d -> a) -> (d -> b) -> d -> c tacit a b c i = a (b i) (c i) ``` In this form, the function looks like this: ``` mean = tacit (/) sum (fromIntegral . length) ``` but it feels like there might be a way to avoid having to use an explicit function such as this. I'm just wondering; is there some way to do this that is built in to Haskell?