Swift: solution to challenge p12 (Swift Programming Lang)

//swift
//get average of variable number or arguments

func averageOfArguments(args: Int...) -> Int {
    var sum = 0
    var avg = 0
    for a in args {
        sum += a
    }
    avg = sum / countElements(args)
    return avg
}

averageOfArguments(10,11,12,13,14)