Average rates notched down slightly to 4.14% with an average of 0.5 points, down from last week’s 4.17%, according to Freddie Mac. A year ago, rates on 30-year mortgages were 4.46%. The rate on an average 15-year mortgage was 3.22% with 0.5 points, down from 3.50% a year ago. For adjustable rate mortgages, a five-year ARM this week averaged 2.98% with 0.3 points and a one-year ARM averaged 2.40% with 0.4 points. Source: Freddie Mac survey.