According to research from the Pew Charitable Trusts, 20 percent of public sector workers don’t know what type of retirement plan their employer offers. From Pew:
One-fifth of state and local workers polled said they did not know what type of retirement plan their employers offered. Women were more likely to say this—23 percent—compared with 15 percent of men. In addition, workers younger than 50 were more likely to report that they did not know what type of retirement plan they had than were workers 50 or older.
In the graph [above], you can see how retirement plan knowledge breaks down by age. Predictably, people pay more attention to plan offerings as they get older.
Chart from Pew Charitable Trusts.