"Real" stats terms (e.g. μ, σ) in F#??

gistfile1.fs

// from http://blog.codebeside.org/post/2011/10/27/F-as-a-OctaveMatlab-replacement-for-Machine-Learning.aspx
let featureNormalize (X: #Matrix<float>) =    
     
    let μ = 
        X.ColumnEnumerator() 
        |> Seq.map (fun (j, col) -> col.Mean()) 
        |> DenseVector.ofSeq
     
    let σ = 
        X.ColumnEnumerator() 
        |> Seq.map (fun (j, col) -> col.StandardDeviation()) 
        |> DenseVector.ofSeq    
     
    let X = 
        X |> Matrix.mapRows (fun i row -> (row - μ) ./ σ)
     
    (X, μ, σ)