What is the F stop range of a holga camera?

Answer 1

It doesn't matter it's gonna vary anyway from camera to camera.
But from Wikipedia:
There is an aperture switch on the camera with two settings: sunny and cloudy. Due to a manufacturing defect, this switch has no effect and there is only one ('cloudy') aperture of around f/13 - although this switch may be easily modified to provide two usable apertures.