What is an average 17 girl surpose to weight at 5 foot 9 inches tall?

Depending on your body frame size, you should weigh between 129 and 170 pounds. See this height and weight chart: http://www.healthchecksystems.com/heightweightchart.htm

You may also get more accurate results if you determine what your body type is. It is very easy; all you have to do is measure around your wrist and adjust your ideal weight to your body frame.

For women:1. Small boned or asthenic - 6 inches or less (15 cm or less)

2. Medium boned or normosthenic - 6 to 7 inches (16-18 cm)

3. Large boned or hypersthenic - 7 inches or more ( 18 cm or more)

Check out http://redirect.alexa.com/redirect?healthy-dietpedia.com/ideal-weight.html for further details.