Swift: Generate a float between 1 - 100

I am trying to generate random floats between 1 and 100, but i keep getting erros everytime i so my set up, currently i am trying:

func returnDbl ()-> Double {
    var randNum = Double(Float(arc4random(101) % 5))
    return randNum
}

print(returnDbl())

but to no avail, would someone point me in the right direction>