WASHINGTON — The average interest rate on the 30-year fixed-rate mortgage isn’t budging from its record low, holding at 3.87 percent for the third week in a row, according to Freddie Mac’s weekly survey of mortgage rates.

The mortgage also averaged 3.87 percent in last week’s survey, and averaged five percent a year ago.

Rates on 15-year fixed-rate mortgages averaged 3.16 percent for the week ending Feb. 16, also unchanged from last week, and down from 4.27 percent a year ago.

The five-year Treasury-indexed hybrid adjustable-rate mortgage averaged 2.82 percent this week, down from 2.83 percent last week and 3.87 percent a year ago.

But one-year Treasury-indexed ARMs averaged 2.84 percent, rising from 2.78 percent last week. The ARM averaged 3.39 percent a year ago.

“Fixed mortgage rates were unchanged this week amid mixed confidence measures,” said Frank Nothaft, vice president and chief economist of Freddie Mac, in a statement.

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