Assets of the nation's 538 money-market mutual funds dropped $101 million to $468.11 billion for the week ended Wednesday, the Investment Company Institute reports.

Average yields for money-market mutual funds were lower in the latest reporting week, reporting organizations said.The 192 institutional funds fell $1.27 billion to $132.69 billion; the 258 general-purpose funds increased $487.1 million to $179.94 billion and the 88 broker-dealer funds rose by $680.6 million to $155.48 billion.

Money market mutual fund assets for the week ended Feb. 27 were revised to $468.21 billion, and the increase was revised to $3.46 billion.

Because a number of funds have been reclassified among categories, weekly money market mutual fund figures have been raised beginning with the period ended Jan. 2.

The Donoghue Organization of Holliston, Mass., said average seven-day simple yields were 6.19 percent, down from 6.29 percent, while 30-day simple yields were also lower at 6.34 percent, off from 6.46 percent.

The average maturity of fund portfolios was 54 days, unchanged.

The Bank Rate Monitor in North Palm Beach, Fla., gave average rates as follows: money-market deposit accounts, 5.62 percent, unchanged from last week; Super-Now, 4.94 percent, down from 4.95; six-month certificates of deposit, 6.42 percent, down from 6.43 percent; 1-year CDs, 6.60 percent, up from 6.59 percent; 2 1/2-year CDs, 6.85 percent, unchanged; and five-year CDs, 7.26 percent, up from 7.25 percent.

The average rate for a one-year, adjustable-rate mortgage was 7.5 percent, up from 7.49 percent.

The average rate on a 15-year, fixed-rate mortgage was 9.1 percent, up from 8.91 percent. The average rate for a 30-year, fixed-rate mortgage moved up to 9.35 percent from 9.18 percent the previous week.

The average rate for a four-year automobile loan was 12.08 percent, unchanged from the prior week.