The site at http://en.wikipedia.org/wiki/Glide_ratio says the glide ratio of a Cessna 150 is about 7:1. It took about 15 seconds to type that into Google to find two sources that corroborate that.
Mark Langford, Huntsville, Alabama see KR2S project N56ML at http://home.hiwaay.net/~langford email to N56ML "at" hiwaay.net