(Bloomberg) -- More than 250,000 Americans selected private health-insurance plans through Obamacare enrollment systems last month, better than twice as many as in October when the exchanges opened amid technology errors and outages.

Kathleen Sebelius, the U.S. health secretary, asked today for a formal investigation of what went wrong with the Oct. 1 debut and said she’s taking steps to prevent future failures. While the Obama administration said it’s optimistic about the improved performance of the online marketplaces, it remains far behind in the effort to meet the U.S. Congressional Budget Office’s projected enrollment of 7 million people by March 31.

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