right health script?

You would put this on as one of the scripts for a health GUI right?

local char = workspace:findFirstChild(script.Parent.Parent.Parent.Name)
hum = char.Humanoid
hum.Changed:connect(function()
	script.Parent.Frame.Health.Frame.Size = UDim2.new(hum.Health/hum.MaxHealth,0,1,0)
	if hum.Health <= hum.MaxHealth*0.15 then
		script.Parent.Frame.Health.Frame.BackgroundColor3 = Color3.new(150,0,0)
	else
		script.Parent.Frame.Health.Frame.BackgroundColor3 = Color3.new(0,170,0)
	end
end)

What are you even asking here?