Average rates on 30-year and 15-year fixed-rate mortgages fell three basis points, and the 5/1 ARM declined one basis point, according to a NerdWallet survey of daily mortgage rates published by national lenders. The drop in rates followed tame inflation news. The core Consumer Price Index (for items excluding food and energy) was up 1.7% in September compared with... Holden Lewis is a writer at NerdWallet.