I think you'll find it's a typo... Perhaps download another POH. Mine has 52-61 knots for a normal approach, but it's a 150D taildragger with manual flaps.
Sir George speaks very wisely! The 150 is just a real pleasure to fly, this 40' flap nonsense is just that. I use whatever flap setting is appropriate and always remember it's a 150 and therefore has 150 performance
Once you get a handle on shortfielders you'll have a blast! I can get mine back to 35 knots indicated and stop in less than 150'
