There is no set rate for Strata Management. Basically its an open market. Each strata management company decides what they want to charge in fees. The owners decide if they accept the fees or not. The thing to do is to seek management proposals from other companies. That way you can compare fees. Just make sure you take into account, size of company (do they have the ability in house to manage your property?) or would they outsource a lot which adds to costs.
Even though there is no agreement between strata managers as to standard fees. We all lose and pick up properties from other management companies so there is a general feel as to what is being charged. So its not absolutely random amounts.
Also you need to take into account is there anything about your property that may demand extra and more demanding work.