laSommeDe = (tableau) ->
    _S = 0
    _S += _e for _e in tableau
    _S

laMoyenneDe = (tableau) ->
    laSommeDe(tableau)/tableau.length

laVarianceDe = (tableau) ->
    laMoyenneDe (carré(x-laMoyenneDe(tableau)) for x in tableau)

lEcartTypeDe = (tableau) ->
    laRacineDe laVarianceDe tableau
    
laMédianeDe = (tableau) ->
    _t = tableau
    _t.sort (x,y)->(x > y)
    if _t.length % 2 is 0
        _indice = _t.length/2-1
        (_t[_indice]+_t[_indice+1])/2
    else
        _indice = (_t.length-1)/2
        _t[_indice]